Endocrinology

aid in diagnosing congenital adrenal hyperplasia

a steroid hormone produced primarily in the adrenal glands

17-OHP is a hormone involved in cortisol production. In females, normal levels vary by menstrual cycle phase.

DHT activity marker

DHT

Pituitary hormone

Antidiuretic Hormone

Primary hyperaldosteronism test

Hormone test

related to primary aldosteronism

DHEA and androstenedione are androgen precursors

Anti-Müllerian Hormone (AMH) is a hormone produced by granulosa cells in ovarian follicles and plays a vital role in reproductive health. It is commonly used as a marker to assess ovarian reserve—the number of viable eggs a woman has left. This test is frequently ordered as part of fertility evaluations, to monitor ovarian function, or to predict menopause onset. In men, AMH is secreted by Sertoli cells in the testes and plays a role in early sexual differentiation, although clinical testing in adult males is rare. Why the AMH Test Is Important AMH levels provide insight into a woman’s fertility potential because they reflect the number of small, developing follicles in the ovaries. Unlike other reproductive hormones such as FSH (follicle-stimulating hormone), AMH levels remain relatively stable throughout the menstrual cycle, making it a reliable measure of ovarian reserve at any time of the month. The test is often used in: Evaluating fertility and guiding assisted reproductive technologies (ART), like IVF Diagnosing or monitoring polycystic ovary syndrome (PCOS) Assessing risk of early menopause or diminished ovarian reserve Monitoring ovarian function in women undergoing chemotherapy or other treatments that affect fertility Diagnosing certain ovarian tumors that may produce AMH What Do AMH Results Mean? Low AMH Levels Low AMH levels may suggest a reduced ovarian reserve. This can occur naturally with age, especially as a woman approaches perimenopause or menopause, but may also result from genetic factors, autoimmune diseases, surgical removal of part of the ovary, or exposure to chemotherapy or radiation. Low AMH doesn’t necessarily mean infertility, but it may indicate a lower chance of success with fertility treatments, particularly IVF. Causes of Low AMH: Advancing age Premature ovarian insufficiency (POI) Certain genetic conditions (e.g., Turner syndrome) Previous ovarian surgery Chemotherapy or radiation therapy Autoimmune ovarian damage High AMH Levels Elevated AMH levels can suggest a high number of antral follicles and are often seen in women with PCOS, a hormonal disorder characterized by irregular periods, cystic ovaries, and excess androgen levels. High AMH in this context may be associated with anovulation (lack of ovulation), which can impair fertility despite a high ovarian reserve. Causes of High AMH: Polycystic ovary syndrome (PCOS) Granulosa cell tumors of the ovary Use of certain fertility medications that stimulate follicular growth Normal AMH Levels by Age (General Guidelines) Age Range (Years) Expected AMH Level (ng/mL) 20–24 1.9 – 6.7 25–29 1.5 – 5.4 30–34 1.2 – 4.1 35–39 0.5 – 3.1 40–44 0.2 – 2.2 45–50 < 1.0 Note: Reference ranges can vary between laboratories. AMH and Fertility Planning Understanding your AMH levels can help guide decisions about when to try to conceive, whether to consider egg freezing, or whether assisted reproductive technologies may be needed. However, AMH is not a direct predictor of the ability to get pregnant—it provides a snapshot of egg quantity, not egg quality. Women with normal or even high AMH can still face fertility challenges due to egg quality, ovulation disorders, or uterine conditions. Conversely, women with low AMH may still conceive naturally, especially if they are younger and ovulate regularly. Key Takeaways AMH is a valuable indicator of ovarian reserve, useful in fertility evaluations and reproductive planning. Low levels may indicate reduced fertility or approaching menopause, while high levels may suggest PCOS. AMH is one of several markers that should be interpreted alongside clinical history, other hormone tests (like FSH, LH, estradiol), and ultrasound findings. This test is also important in fertility preservation discussions and during IVF cycle planning.

a subunit of Human Chorionic Gonadotropin (hCG)

Bone resorption marker measuring type I collagen breakdown rate.

a hormone that plays a role in regulating the level of calcium

Measures vasopressin activity, useful for diagnosing various health conditions.

to help diagnose adrenal insufficiency

Cortisol is a stress hormone produced by the adrenal glands.

Cortisol – Saliva (ng/mL): Understanding the Biomarker Cortisol, often referred to as the "stress hormone," is a steroid hormone produced by the adrenal glands in response to signals from the hypothalamic-pituitary-adrenal (HPA) axis. It plays a vital role in regulating metabolism, immune responses, blood pressure, and the body's stress response. Measuring cortisol levels in saliva provides a non-invasive and accurate way to evaluate the body's cortisol production throughout the day. Why Test Cortisol in Saliva? Salivary cortisol testing is a convenient and effective way to assess circadian cortisol rhythm, which is how cortisol levels fluctuate naturally over 24 hours. This biomarker is particularly valuable for evaluating: Stress-related conditions (e.g., chronic stress, burnout, anxiety). Adrenal function (e.g., adrenal insufficiency, adrenal fatigue, or hyperactivity). Sleep disorders (e.g., insomnia or disrupted circadian rhythm). HPA axis dysregulation, which may result from prolonged stress or illness. How Is Salivary Cortisol Measured? Salivary cortisol levels are typically measured at multiple time points throughout the day to assess the daily cortisol curve: Morning (upon waking): Cortisol is naturally highest in the morning, providing energy for the day ahead. Midday: Levels gradually decline after the morning peak. Afternoon: A further decline is expected as the day progresses. Evening and Night: Cortisol levels are at their lowest to promote relaxation and sleep. Results are reported in nanograms per milliliter (ng/mL), with specific reference ranges provided for each time point. What Do Abnormal Cortisol Levels Indicate? Elevated Cortisol Levels Possible Causes: Chronic stress or anxiety. Cushing's syndrome (excess cortisol production by the adrenal glands). Sleep disorders or disrupted circadian rhythm. Depression or psychiatric conditions. Excessive caffeine or stimulant use. Symptoms: Weight gain (especially around the abdomen). Difficulty sleeping. Fatigue or burnout. Elevated blood pressure. Suppressed immunity. Low Cortisol Levels Possible Causes: Adrenal insufficiency (e.g., Addison’s disease). Chronic fatigue syndrome or adrenal fatigue. Hypopituitarism (reduced pituitary gland function). Prolonged illness or trauma. Symptoms: Chronic fatigue or lack of energy. Difficulty coping with stress. Low blood pressure or dizziness. Muscle weakness. Low blood sugar levels (hypoglycemia). Clinical Uses of Salivary Cortisol Testing Stress and Burnout Assessment Evaluates how chronic stress affects the HPA axis and overall cortisol production. Diagnosis of Adrenal Disorders Detects adrenal insufficiency (low cortisol) or hypercortisolism (high cortisol). Sleep Disorders Identifies irregular cortisol patterns contributing to insomnia or poor sleep quality. Monitoring Treatment Progress Tracks the effectiveness of interventions aimed at regulating cortisol levels, such as stress management techniques or medications. How to Prepare for a Salivary Cortisol Test Avoid food, drinks (except water), and oral hygiene products for at least 30 minutes before sample collection. Avoid caffeine, alcohol, and intense exercise for 12-24 hours before the test. Collect saliva samples at the designated times to capture the circadian rhythm accurately. Improving Cortisol Balance Stress Management: Practice relaxation techniques such as mindfulness, yoga, or meditation. Engage in regular moderate exercise (avoid overtraining). Sleep Hygiene: Maintain a consistent sleep schedule. Create a calming bedtime routine and minimize screen time before bed. Diet and Nutrition: Focus on a balanced diet rich in whole foods, omega-3 fatty acids, and magnesium. Avoid excessive caffeine and sugar. Medical Intervention: Work with a healthcare provider to address underlying conditions affecting cortisol production. Conclusion Salivary cortisol testing provides a comprehensive view of cortisol production and HPA axis function, making it a valuable tool for diagnosing and managing stress-related conditions, adrenal disorders, and sleep disturbances. By identifying and addressing abnormal cortisol levels, individuals can take targeted steps toward restoring balance and optimizing health.

plays a key role in transport of cortisol

aka stress hormone

A stress hormone whose normal range depends on draw time.

a steroid that is produced by both the adrenal cortex and the testis

a building block of steroid hormones

Understanding the Dexamethasone Suppression Test (DST) Dexamethasone is a synthetic glucocorticoid used in diagnostic testing to evaluate the hypothalamic-pituitary-adrenal (HPA) axis, your body's stress response system. If this biomarker appears on your lab report, it typically indicates you've undergone a Dexamethasone Suppression Test (DST). The DST assesses how your body responds to glucocorticoids, hormones that regulate stress response, metabolism, immunity, and inflammation. The test involves taking an oral dose of dexamethasone at bedtime, followed by a blood test to measure cortisol levels the next morning. Normally, dexamethasone suppresses cortisol production. Test Results and Diagnostic Insights Normal Response: Cortisol levels are appropriately suppressed, indicating a healthy HPA axis. Abnormal Response: Persistently high cortisol levels may suggest conditions like Cushing's syndrome, adrenal insufficiency, or even certain types of depression. Factors Influencing Results Current medications, stress, and underlying medical conditions can affect the test's accuracy. For this reason, DST results should always be interpreted by a healthcare professional, who can provide personalized guidance based on your health history and test results. If dexamethasone is mentioned on your lab report, schedule a discussion with your healthcare provider to understand the implications and determine any necessary next steps for your health.

DHEA - Saliva (pg/mL): An Overview DHEA (Dehydroepiandrosterone) is a steroid hormone produced primarily by the adrenal glands, with smaller contributions from the ovaries or testes. It serves as a precursor for other sex hormones, such as testosterone and estrogen, and plays a critical role in regulating various physiological processes. Measuring DHEA levels in saliva provides insight into adrenal gland function, hormonal balance, and overall health. Why Measure DHEA in Saliva? Saliva testing offers a non-invasive, convenient method to assess bioavailable DHEA. Unlike serum testing, which measures both bound and unbound hormone levels, saliva testing reflects the active, free form of DHEA that is readily available for use by the body. Normal Ranges DHEA levels vary based on age, sex, and time of day. They are typically highest in the morning and decline throughout the day. The reference range for DHEA in saliva is generally expressed in pg/mL and may vary slightly between laboratories. Functions of DHEA Hormone Production: Acts as a precursor for testosterone and estrogen synthesis. Stress Response: Helps modulate the body's reaction to stress by balancing cortisol levels. Immune System Support: Enhances immune function and reduces inflammation. Bone Health: Supports bone density by interacting with other hormones like estrogen. Cognitive Health: Plays a role in memory, mood, and overall brain function. What Do Abnormal Levels Indicate? High DHEA Levels Elevated levels of DHEA in saliva may indicate: Adrenal Hyperactivity: Often linked to chronic stress or overactivation of the hypothalamic-pituitary-adrenal (HPA) axis. Polycystic Ovary Syndrome (PCOS): Common in women, with symptoms like irregular periods, hirsutism, and acne. Androgen Excess: Can lead to symptoms like increased body hair, oily skin, or hair loss. Adrenal Tumors or Disorders: Rare but may contribute to increased DHEA production. Low DHEA Levels Reduced DHEA levels may suggest: Adrenal Insufficiency or Fatigue: Often caused by chronic stress, leading to depleted adrenal reserves. Aging: DHEA production naturally declines with age, typically starting in the mid-30s. Chronic Illness or Immune Dysfunction: Conditions like autoimmune diseases or prolonged infections may lower DHEA levels. Hormonal Imbalances: Low DHEA can disrupt estrogen and testosterone synthesis, leading to fatigue, low libido, and mood changes. Clinical Uses of DHEA Testing Stress and HPA Axis Assessment: Evaluates the balance between DHEA and cortisol to identify stress-related imbalances. Hormonal Health Monitoring: Helps diagnose conditions like PCOS, adrenal fatigue, or menopause-related symptoms. Anti-Aging Research: Used to track hormone decline and its impact on physical and cognitive health. Athletic Performance: Assesses hormonal balance in athletes to prevent overtraining or stress-induced imbalances. How to Optimize DHEA Levels Manage Stress: Practice relaxation techniques like mindfulness, yoga, or meditation to support adrenal health. Improve Sleep Hygiene: Aim for 7–9 hours of quality sleep to maintain healthy hormone cycles. Balanced Diet: Include nutrient-dense foods rich in zinc, magnesium, and healthy fats to support hormone production. Exercise Moderately: Regular, moderate physical activity can improve hormonal balance without overtaxing the adrenal glands. Consider Supplementation: In cases of low DHEA, healthcare providers may recommend DHEA supplements under supervision. Conclusion The DHEA - Saliva (pg/mL) test is a valuable tool for assessing adrenal health, hormonal balance, and overall well-being. Abnormal levels can provide critical insights into stress response, aging, and endocrine function. By addressing underlying causes and adopting a proactive approach, individuals can optimize their DHEA levels and enhance their overall health. Always consult a healthcare provider for personalized interpretation and guidance.

The DHEA-S (Dehydroepiandrosterone Sulfate) to cortisol ratio is a marker used in assessing adrenal gland function and can provide insight into the balance of hormones produced by these glands. DHEA-S is an androgen precursor produced by the adrenal glands, which is then converted into more potent androgens or estrogens within tissues. Cortisol, also produced by the adrenal glands, is a steroid hormone pivotal to the stress response, glucose metabolism, and inflammation control. An optimal balance between DHEA-S and cortisol is crucial for maintaining health, as it reflects the state of adrenal function and the body’s response to stress. A skewed ratio, with either elevated DHEA-S or cortisol, could indicate various conditions, including adrenal fatigue, Cushing's syndrome, adrenal hyperplasia, or adrenal insufficiency. Evaluating this ratio helps clinicians understand if there's an overproduction or underproduction of these hormones, guiding diagnostic and therapeutic decisions.

Dehydroepiandrosterone

What is DHT? Dihydrotestosterone (DHT) is a potent hormone derived from testosterone. It plays a crucial role in the development of male characteristics, including: - Facial hair growth - Deepening of the voice - Other aspects of male puberty In adults, DHT continues to affect hair growth, skin health, and prostate function. What Does "Free DHT" Mean? Most DHT in the body is bound to proteins such as sex hormone-binding globulin (SHBG) and albumin. However, a small portion remains unbound, or "free." This free DHT is biologically active and can directly influence tissues, making it a valuable marker for assessing hormonal activity. Mechanism: DHT becomes "free" when it's not attached to carrier proteins. This unbound state allows it to easily enter cells and interact with androgen receptors, making it more biologically potent than bound DHT. Why is Free DHT Important? Testing free DHT levels can provide insights into several health conditions: Condition Relation to Free DHT Hair Loss High levels associated with androgenetic alopecia Prostate Health Elevated levels may indicate BPH or prostate cancer risk Hormonal Disorders Useful in diagnosing conditions like PCOS Sexual Development Abnormal levels can signal issues with puberty timing When to Test for Free DHT? Healthcare providers may order a free DHT test when symptoms suggest hormonal imbalances, such as: - Unusual hair loss or thinning - Acne and oily skin - Changes in libido - Signs of virilization in women (e.g., deep voice, increased body hair) How is Free DHT Measured? Free DHT is measured through a blood test. A laboratory analysis determines the amount of unbound DHT in the bloodstream. Normal Ranges: Men: Typically 0.5-2.5 pg/mL Women: Usually 0.1-0.5 pg/mL Note: Ranges may vary slightly between laboratories. Free DHT vs. Total DHT Testing While total DHT tests measure both bound and unbound DHT, free DHT tests focus solely on the biologically active, unbound portion. Free DHT testing can provide a more accurate picture of the hormone's immediate effects on tissues. Limitations and Considerations Time of day can affect DHT levels Certain medications may interfere with test results Results should be interpreted in context with other hormonal tests and clinical symptoms Relationship with Other Hormones Free DHT levels are influenced by and can influence other hormones: Testosterone: The primary precursor to DHT Estrogen: Can affect the enzyme that converts testosterone to DHT Progesterone: May compete with DHT for receptor binding

a potent androgen hormone derived from testosterone

Estradiol (Estrogen) is a female hormone, produced primarily in the ovary. The amount of estrogen produced depends on the phase of the menstrual cycle.

The free, active fraction of estradiol measured in saliva.

Estrogen hormone in men produced via testosterone aromatisation.

What Is Estradiol, Free (Male)? Free Estradiol measures the small, biologically active portion of estradiol, the most potent form of estrogen, that is not bound to proteins in the blood. In men, estradiol plays an important role in bone health, brain function, libido, and regulating the balance between testosterone and estrogen. This test specifically looks at the free (unbound) estradiol in the bloodstream—meaning the portion that can enter cells and affect tissues. It can offer a more precise view than total estradiol, especially in cases where symptoms don’t match total hormone levels. Reference Range for Adult Males: ≤ 0.45 pg/mL What Do Low or High Levels Mean? High free estradiol in males (above 0.45 pg/mL) may be associated with: Weight gain or excess body fat (especially abdominal) Low libido or erectile dysfunction Gynecomastia (breast tissue development) Mood swings or fatigue Imbalance in the testosterone-to-estrogen ratio Liver or metabolic dysfunction Elevated levels are often seen with excess aromatase activity—the enzyme that converts testosterone to estrogen—or due to obesity, alcohol use, or certain medications. Low free estradiol is less common in men but may impact bone density, mood, or cardiovascular health. Estradiol, while primarily thought of as a female hormone, is critical for bone maintenance in men, and extremely low levels may increase the risk of osteoporosis over time. Why This Test Matters Testing free estradiol gives a clearer picture of hormonal balance, especially when evaluating testosterone therapy, infertility, gynecomastia, or unexplained symptoms like fatigue or low libido. Because only a small fraction of estradiol is free and active, this test can be more revealing than total estradiol levels alone.

female hormone

What Is Estradiol, Ultrasensitive, LC/MS (Male)? Estradiol, Ultrasensitive, LC/MS is a highly accurate test that measures very low levels of estradiol (E2)—the most potent form of estrogen—in the male body. This version uses liquid chromatography-tandem mass spectrometry (LC/MS or LC-MS/MS), a gold-standard method for hormone testing, especially when precise measurement at low concentrations is required. In men, estradiol is mainly produced through the conversion of testosterone via the enzyme aromatase. While estrogen is often thought of as a female hormone, estradiol plays several important roles in male health, including maintaining bone density, supporting mood and cognitive function, regulating libido, and contributing to cardiovascular health. Why Use the “Ultrasensitive” LC/MS Method? Standard estradiol tests may not accurately detect the low estradiol levels typically found in men. The ultrasensitive LC/MS test offers much greater accuracy and is particularly useful for: Monitoring men on testosterone replacement therapy (TRT) Evaluating symptoms of hormonal imbalance, such as low libido, gynecomastia, or mood changes Assessing fertility concerns or estrogen-producing tumors Reference Range (Adult Males): ≤ 29 pg/mL What Do Abnormal Results Mean? Elevated estradiol may result from increased conversion of testosterone to estrogen, which is more common in men with higher body fat, liver dysfunction, or those taking certain medications. Symptoms can include fatigue, weight gain, gynecomastia (breast tissue development), and reduced libido. Low estradiol levels in men can contribute to reduced bone density, cognitive issues, and may affect sexual function—even if testosterone levels are normal. In summary, Estradiol, Ultrasensitive, LC/MS is a valuable tool for understanding subtle hormonal imbalances in men and is particularly useful when precise hormone tracking is needed for diagnosis or treatment monitoring.

Estriol is one of three estrogen hormones. Estriol levels rise throughout pregnancy, helping to keep your uterus and unborn baby healthy. The levels are at their highest right before childbirth. They help prepare your body for labor and delivery. Everyone makes estriol. But in people who aren’t pregnant, the levels are almost undetectable. Other names for estriol include oestriol and E3. During pregnancy, estriol: - Helps your uterus grow as the fetus gets bigger. - Makes your body more sensitive to other pregnancy hormones. - Prepares your body for labor and delivery and breastfeeding. The third estrogen is known as Estriol (E3) and is produced in significant amounts during pregnancy. In men and women, Estriol is irreversibly produced by estradiol (estriol cannot make estradiol) or from estrone through 16-OH-Estrone which makes it the largest circulating estrogen because both Estrone and Estradiol can make it. Despite this, estriol is not nearly as potent as estradiol (Estradiol is 80x more potent!). The least potent of the estrogens, Estriol (E3) levels are traditionally used clinically to gauge the viability of pregnancies. In the context of this profile, estriol is least likely to be associated with high-estrogen problems (e.g. breast cancer), and is generally viewed as a "protective" estrogen. Conversion of 16alpha-hydroxyestrone to estriol is important to consider. Note: If one is taking a "Bi-Est" or "Tri-Est" preparation, an elevated estriol is not unusual. Reference Ranges: Adult Male ≤0.18 ng/mL Adult Female (Non-pregnant) ≤0.21 ng/mL Pregnancy First trimester ≤2.50 ng/mL Second trimester ≤9.60 ng/mL Third trimester ≤14.60 ng/mL References: https://www.mayocliniclabs.com/test-catalog/Clinical+and+Interpretive/81711

Female hormone

Combined estrone, estradiol, and estriol measured in male serum.

a conjugated form of estrone

a steroid, a weak estrogen, and a minor female sex hormone

a steroid, a weak estrogen, and a minor female sex hormone

aka stress hormone

Navigating the complexities of hormonal health can be challenging, especially when it comes to understanding 'Free Estradiol, Percent'. This marker is crucial for women who are monitoring their hormonal balance, fertility, or overall health. Estradiol is a primary form of estrogen, a hormone that plays a pivotal role in female reproductive health. It influences everything from your menstrual cycle to mood regulation. What sets 'free' estradiol apart is its bioavailability. Unlike total estradiol, which includes all estradiol in your blood (both attached to proteins and unattached), free estradiol refers exclusively to the unbound portion. This unattached estradiol is biologically active and readily available to interact with cells in your body. Measuring the percentage of free estradiol is particularly important as it provides a more accurate insight into the hormone's active influence on your body. Changes in this percentage can be indicative of various conditions, ranging from hormonal imbalances to menopause. For women keen on monitoring their reproductive health, understanding their free estradiol levels can be invaluable. It's an essential aspect of understanding hormonal fluctuations and their impact on your body. While this information is an essential guide, remember that individual health varies greatly, and consulting a healthcare professional for personalized advice is always recommended for accurate interpretation of your hormonal health.

The biologically active, unbound fraction of estradiol in blood.

Free Testosterone - Saliva (pg/mL): Understanding the Biomarker Free Testosterone is the bioavailable form of testosterone, a key androgen hormone responsible for regulating numerous physiological processes in both men and women. The Free Testosterone - Saliva test measures the amount of unbound testosterone in saliva, expressed in picograms per milliliter (pg/mL). Unlike total testosterone tests in blood, saliva testing specifically assesses the hormone’s biologically active fraction, which is readily available for use by the body’s tissues. Functions of Free Testosterone In Men: Regulates sexual function and libido. Supports muscle mass, strength, and fat distribution. Influences sperm production and fertility. Contributes to energy levels and cognitive function. In Women: Supports bone health and muscle maintenance. Enhances libido and sexual function. Affects mood, energy, and focus. Why Test Free Testosterone in Saliva? Saliva testing provides a non-invasive and convenient method for assessing bioactive testosterone levels. Since it measures the free (unbound) hormone, it is particularly useful for: Evaluating symptoms of hormonal imbalances or androgen-related disorders. Monitoring the effects of testosterone replacement therapy (TRT) or other hormonal treatments. Assessing circadian testosterone fluctuations, as levels naturally peak in the morning and decline throughout the day. Normal Ranges for Free Testosterone in Saliva The optimal range for free testosterone in saliva varies based on age, sex, and life stage. Typical reference ranges are: Men: ~50 - 150 pg/mL Women: ~10 - 50 pg/mL Postmenopausal women and older men generally exhibit lower levels due to natural hormonal decline. What Do Abnormal Levels Mean? Elevated Free Testosterone Levels: In Men: Potential Causes: Over-supplementation from testosterone replacement therapy (TRT) or anabolic steroids. Hyperactive adrenal glands producing excessive androgens. Rare conditions such as testosterone-secreting tumors. Symptoms: Aggression or irritability, acne, oily skin, increased body hair, and potentially reduced fertility due to suppressed natural testosterone production. In Women: Potential Causes: Polycystic ovary syndrome (PCOS), characterized by excess androgen production. Adrenal hyperplasia or androgen-secreting tumors. Use of certain medications (e.g., steroids or testosterone therapy). Symptoms: Excessive facial/body hair growth (hirsutism), acne, irregular menstrual cycles, and hair thinning or balding. Low Free Testosterone Levels: In Men: Potential Causes: Aging (andropause) with natural hormonal decline. Chronic illnesses (e.g., diabetes, obesity, or metabolic syndrome). Pituitary or testicular dysfunction (e.g., hypogonadism). Symptoms: Low libido, erectile dysfunction, decreased muscle mass, fatigue, depression, and cognitive decline. In Women: Potential Causes: Natural hormonal decline due to menopause. Chronic stress leading to adrenal insufficiency. Use of medications such as oral contraceptives. Symptoms: Reduced libido, low energy, muscle weakness, and difficulty maintaining bone density. Clinical Applications of Free Testosterone Testing Hormonal Imbalance Evaluation: Helps diagnose conditions like hypogonadism in men or androgen excess in women (e.g., PCOS). Monitoring Hormone Therapy: Tracks the efficacy and safety of testosterone replacement therapy (TRT) or other hormonal interventions. Assessing Reproductive Health: Provides insights into fertility challenges in both men and women. Evaluating Age-Related Hormonal Decline: Identifies low testosterone levels associated with andropause or menopause. Factors Influencing Free Testosterone Levels Age: Levels naturally decline with age in both men and women. Stress: Chronic stress elevates cortisol, which can suppress testosterone production. Lifestyle: Poor diet, lack of exercise, and inadequate sleep negatively impact testosterone levels. Medications: Certain drugs (e.g., corticosteroids, opioids) can reduce testosterone levels. Health Conditions: Obesity, diabetes, and chronic illnesses are linked to lower testosterone. How to Optimize Free Testosterone Levels Healthy Lifestyle: Diet: Incorporate foods rich in zinc (e.g., shellfish, seeds), magnesium (e.g., leafy greens), and healthy fats to support hormone production. Exercise: Engage in regular resistance training and high-intensity interval training (HIIT), which boost testosterone levels naturally. Sleep: Aim for 7-9 hours of quality sleep per night, as testosterone production occurs primarily during sleep. Stress Management: Practice relaxation techniques like yoga, meditation, or deep breathing to reduce cortisol levels. Medical Interventions: For clinically low levels, consult a healthcare provider about hormone replacement therapy (HRT) or testosterone supplementation. Avoid Excessive Alcohol or Smoking: Both can suppress testosterone levels and harm overall health. Conclusion The Free Testosterone - Saliva (pg/mL) test offers a valuable, non-invasive way to assess bioavailable testosterone levels, providing insights into hormonal balance and overall health. Whether monitoring therapy, evaluating symptoms of imbalance, or assessing age-related hormonal decline, this test helps guide personalized interventions to optimize well-being. Always consult a healthcare professional to interpret test results and develop a tailored plan for maintaining hormonal health.

a peptide hormone secreted from the alpha cells of the pancreatic islets

a crucial peptide hormone

a hormone that is important for growth and development in children

a hormone produced in the body during pregnancy

related to Type 1 diabetes

Identify women who are at high risk for developing preëclampsia

helps manage growth and development

Understand what low or high IGF-BP3 levels mean. IGF-BP3 reflects growth hormone activity and IGF-1 function, helping assess metabolism, growth, and overall hormonal health.

a hormone that is produced by your body’s fat cells.

plays a crucial role in the female reproductive system

What is Percent Free Cortisol? Percent Free Cortisol, Serum refers to the proportion of cortisol in your blood that is not attached to proteins such as corticosteroid-binding globulin (CBG) or albumin. While about 90–95% of circulating cortisol is bound to these proteins and biologically inactive, the remaining 5–10% is “free” and able to enter cells, where it triggers important physiological effects-including the stress response, metabolism regulation, and immune system modulation. Why is Percent Free Cortisol Important? Most standard cortisol tests measure total cortisol, which includes both bound (inactive) and free (active) forms. However, only free cortisol is immediately available for your body to use. Measuring the percentage of free cortisol (rather than just the total or absolute free cortisol level) provides insight into how much of your cortisol is active versus stored. This is particularly important in situations where the levels of binding proteins change, such as during pregnancy, liver disease, or with certain medications, which can make total cortisol results misleading. Calculating percent free cortisol-or using related indices like the Free Cortisol Index (total cortisol divided by CBG)-can reveal subtle imbalances in adrenal function that may not show up in standard tests. Note: Direct measurement of free cortisol in blood is technically challenging and not always available. Sometimes, percent free cortisol is calculated based on total cortisol and binding protein levels. Salivary cortisol is also used as a noninvasive surrogate for free cortisol in some settings. What Does a High Percent Free Cortisol Mean? An elevated percent free cortisol can indicate: Reduced cortisol-binding proteins: Seen in liver disease or high estrogen states (e.g., pregnancy). Increased cortisol production: Such as from chronic stress or Cushing’s syndrome. Overuse of corticosteroid medications: Which can disrupt normal cortisol regulation. What Does a Low Percent Free Cortisol Mean? A low value may suggest: Increased levels of cortisol-binding globulin: This reduces the free fraction, and is seen with estrogen therapy or oral contraceptive use. Adrenal insufficiency or reduced cortisol production: The adrenal glands are not making enough cortisol. Certain inflammatory or autoimmune conditions: These can affect cortisol availability or binding. Clinical Use Percent free cortisol testing is especially helpful when total cortisol results do not match a patient’s symptoms. It may be ordered during investigations of: Adrenal disorders (like Addison’s disease or Cushing’s syndrome) Unexplained fatigue or weakness Abnormal stress responses Situations where binding protein levels are altered (e.g., pregnancy, liver disease, critical illness) Summary Table Aspect Bound Cortisol (CBG + Albumin) Free Cortisol (Percent Free) Fraction of total 90–95% 5–10% Biological activity Inactive Active (enters cells, exerts effects) Affected by protein changes Yes No Clinical relevance May mislead in illness, pregnancy Reflects true adrenal function In summary: Measuring percent free cortisol helps provide a more accurate picture of your adrenal health, especially when total cortisol levels are difficult to interpret due to changes in binding proteins or unusual clinical situations.

a crucial neurosteroid in males

Progesterone is present in men but at a much lower level than found in premenopausal women.

Reproductive hormone; varies widely by cycle phase and pregnancy status.

Serum prolactin level measuring pituitary hormone for reproductive evaluation.

Hypertension test - kidney

What is Free Testosterone? Free testosterone refers to the small portion of total testosterone in your blood that is not bound to proteins like sex hormone–binding globulin (SHBG) or albumin. Because it’s “free,” this fraction is biologically active — it can enter cells and activate androgen receptors to carry out testosterone’s functions. In women, testosterone is produced in small amounts by the ovaries, adrenal glands, and through the peripheral conversion of other hormones. Even though testosterone is often considered a “male hormone,” it plays essential roles in female health, including: Supporting bone density and muscle strength Maintaining libido and sexual response Contributing to mood stability and cognitive function Helping with energy balance and overall vitality Why Measure Free Testosterone? Measuring free testosterone is often more informative than measuring total testosterone alone. This is because protein levels (especially SHBG) can fluctuate due to age, medications, thyroid status, weight changes, and other hormonal shifts. Normal total testosterone + low free testosterone can happen if SHBG is high. Low total testosterone + normal free testosterone can occur if SHBG is low. For women, testing free testosterone can help investigate: Menstrual irregularities Symptoms of excess androgens (e.g., acne, unwanted hair growth, hair thinning on scalp) Low libido, fatigue, or low muscle tone Suspected polycystic ovary syndrome (PCOS) Hormonal changes during perimenopause or menopause Effects of hormone therapy Reference Range – LifeLabs LifeLabs provides its own method-specific reference ranges for free testosterone in females. Your report might show results in pg/dL or pmol/L, but the reference interval and cut-off for “normal” depend on the laboratory’s calibration. For example, a lab might list: Reference interval: 0.7 – 2.0 pg/dL Or Less than: 30 pmol/L Because LifeLabs uses its own validated method, ranges may not match those found in other labs or online charts. Always interpret your result in the context of the range shown on your report. What Does a Low Free Testosterone Mean in Women? Low free testosterone in females can be due to: Natural aging (especially after menopause) Ovarian insufficiency or surgical removal of ovaries Pituitary or adrenal disorders Chronic illness or inflammation Certain medications (e.g., oral estrogens, glucocorticoids, anti-androgen drugs) High SHBG levels (often linked to high estrogen, hyperthyroidism, or certain medications) Possible symptoms of low free testosterone: Low sexual desire Decreased muscle mass and strength Reduced bone density Fatigue Low mood or cognitive fog What Does a High Free Testosterone Mean in Women? High free testosterone levels in females may be caused by: Polycystic ovary syndrome (PCOS) Ovarian or adrenal androgen-secreting tumors (rare) Late-onset congenital adrenal hyperplasia (CAH) Low SHBG (seen in insulin resistance, obesity, or hypothyroidism) Use of testosterone or other androgenic medications/supplements Possible symptoms of high free testosterone: Excess facial or body hair (hirsutism) Acne and oily skin Scalp hair thinning (androgenic alopecia) Irregular or absent menstrual cycles Fertility difficulties How to Support Healthy Free Testosterone Levels Maintaining balanced free testosterone involves addressing underlying causes rather than chasing a “perfect” number. Strategies may include: For low levels: Address nutritional deficiencies, manage stress, maintain a healthy weight, and discuss hormone therapy options with your healthcare provider if symptoms are significant. For high levels: Manage insulin resistance, reduce refined carbohydrate intake, support weight balance, and treat underlying hormonal conditions like PCOS. Key Takeaway Free testosterone is the active fraction of testosterone in a woman’s blood and can provide valuable insight into hormonal health. LifeLabs uses its own testing method and reference ranges, so interpretation should always be done with your healthcare provider, considering symptoms, medical history, and other lab results.

Total Testosterone in the context of a female hormone panel refers to the total amount of testosterone present in a woman's blood, measured in nanograms per milliliter (ng/mL). Testosterone, commonly associated with male health, is actually an important hormone in females as well, albeit in lower concentrations. It plays a critical role in muscle strength, bone density, and the functioning of the reproductive organs. Additionally, it influences libido, mood, and overall energy levels. The normal range of total testosterone in women varies depending on factors such as age and health conditions, but it generally falls between 15 to 70 ng/mL. Levels outside this range can indicate various health issues. For example, higher levels might suggest conditions like polycystic ovary syndrome (PCOS), which can lead to symptoms like irregular menstrual cycles, acne, and excessive hair growth. On the other hand, lower levels might be a sign of adrenal insufficiency or the menopausal transition, potentially contributing to decreased muscle mass, fatigue, and a diminished sex drive. Understanding the level of total testosterone is essential for diagnosing and managing potential health concerns in females, highlighting the importance of including this marker in hormone panels.

compares your bone density to the average bone density of people your own age and gender

compares your bone density to the average bone density of people your own age and gender