ZRT Laboratory

The thyroid is a small, butterfly-shaped gland located just below the Adam's apple, playing a crucial role in regulating metabolism, energy, and overall hormonal balance. However, various factors, such as hormone imbalances, mineral deficiencies, and environmental pollutants, can disrupt thyroid function, leading to significant health issues. Thyroid Dysfunction is Often Under-Diagnosed According to the American Thyroid Association, up to 60% of people with thyroid disorders may be unaware of their condition. Thyroid problems disproportionately affect women, who are seven times more likely than men to experience thyroid dysfunction, with up to a one-in-five chance of developing issues, especially during perimenopause when hormone levels fluctuate. Thyroid dysfunction can manifest through a wide range of symptoms. Do any of these sound familiar? Signs of Hypothyroidism: Unexplained weight gain or difficulty losing weight despite a healthy diet and exercise Feeling cold when others don’t Persistent fatigue, particularly in the evening Brain fog or memory lapses Dry, itchy skin and thinning hair Brittle nails Hair loss Irregular bowel movements Menstrual irregularities Signs of Hyperthyroidism: Sudden or unexplained weight loss Rapid or irregular heartbeat Excessive sweating Nervousness or irritability What Does the Blood Spot Thyroid Testing Panel Measure? This comprehensive panel assesses levels of key thyroid hormones to determine if there’s an imbalance: TSH (Thyroid-Stimulating Hormone): Produced by the pituitary gland, TSH stimulates the thyroid to produce thyroxine (T4). Free T4 (Thyroxine): The main hormone produced by the thyroid, T4 is converted to its active form, T3, in the body’s cells. Total T4: This includes both free T4 and protein-bound T4, offering insight into the thyroid's ability to produce and release T4 into the bloodstream. Free T3 (Triiodothyronine): T3 is the active hormone responsible for regulating the metabolic activity of cells. TPOab (Thyroid Peroxidase Antibodies): These antibodies, produced in autoimmune conditions like Hashimoto’s, target the thyroid gland. Measuring TPOab levels helps diagnose autoimmune thyroid diseases. By using a blood spot sample, this testing panel provides a convenient way to evaluate thyroid function, helping identify imbalances that could be affecting your overall health and well-being. Thyroid health can be compromised by nutritional deficiencies, particularly in iodine and selenium, as well as by overexposure to harmful elements like bromine, arsenic, cadmium, and mercury. These substances are prevalent in our environment, found in the food we eat, the water we drink, the materials we come into contact with, and the air we breathe. Elements That Affect Thyroid Function: Iodine: Iodine is crucial for the production of key thyroid hormones, T4 and T3. A deficiency in iodine can hinder hormone production, leading to hypothyroidism, goiter, and cognitive decline. Iodine deficiency has also been linked to an increased risk of breast cancer. Common sources of iodine include dairy products, seafood, iodized salt, and grains. Bromine: This element is often found in flame retardants, fumigants, medications, and pool/spa sanitizers. High environmental exposure to bromine can lead to excessive accumulation in the body, disrupting thyroid function. Selenium: Selenium is essential for thyroid hormone production, neutralizing free radicals, DNA synthesis, and cancer prevention. While too much selenium can be toxic, insufficient selenium levels impair the conversion of T4 to T3, affecting thyroid health. Common dietary sources of selenium include Brazil nuts, seafood, eggs, and grains. Arsenic: An environmental heavy metal, arsenic has multiple toxic effects on the body and can interfere with selenium function, leading to deficiency. It is found in shellfish, seaweed, rice, fruit, and well water. Mercury: Mercury is a highly toxic heavy metal that can damage the brain and nervous system. It impacts thyroid function by inhibiting selenium and mimicking the effects of arsenic exposure. High mercury levels can accumulate from sources like dental amalgams, seafood, and certain vaccinations. Cadmium: Chronic exposure to cadmium can cause the accumulation of this metal in the thyroid gland, resulting in tissue damage. Smoking is a major source of cadmium exposure, with smokers having about twice the levels of non-smokers. Maintaining optimal levels of these elements, while avoiding excessive exposure to toxins, is crucial for supporting healthy thyroid function.

What Is Dried Blood Spot (DBS) Testing? Dried Blood Spot (DBS) testing is a simple, convenient method for measuring essential and toxic elements using a small sample of whole blood collected on filter paper. It's an excellent alternative to traditional liquid blood draws and offers several advantages—especially when testing elements that are stored primarily inside red blood cells, such as lead, zinc, and magnesium. Why Use Whole Blood Instead of Serum? Most standard blood tests analyze serum (the clear liquid part of blood), but this isn’t always the best way to detect nutrient deficiencies—especially for minerals that are mostly found inside red blood cells. Zinc and Lead: These elements are concentrated in red blood cells, making whole blood testing (like DBS) more accurate than serum tests. Magnesium: Serum magnesium levels are tightly controlled by the body’s homeostasis, often staying "normal" even when your intracellular magnesium is low. DBS provides a better view of your true magnesium status. Copper and Zinc: DBS testing captures both intracellular and extracellular levels, helping detect imbalances or deficiencies earlier than standard serum or plasma tests. What About Arsenic? Arsenic is not measured using DBS, because it is rapidly cleared from the bloodstream. Instead, urine testing is the best way to assess recent arsenic exposure. Understanding DBS Reference Ranges It's important to note that DBS reference ranges are different from those used in serum testing. Because whole blood contains both plasma and red blood cells, levels measured in DBS are not directly comparable to serum results. For accurate interpretation, element-specific DBS reference ranges should always be used. Key Benefits of Dried Blood Spot Testing Convenient: Requires only a small finger-prick sample Accurate: Better reflects intracellular mineral levels Early detection: Identifies deficiencies that serum tests may miss Useful for at-home testing: Easy sample collection and shipping Dried Blood Spot testing is an effective tool for monitoring nutritional status and toxic element exposure, offering a clearer picture of your health—especially when traditional blood tests fall short.

Analyzing elements can provide insight into why you may not synthesize or convert thyroid hormones and can help determine the cause of thyroid related symptoms. The thyroid gland regulates cellular energy metabolism, as well as controls heart rate and protein synthesis for proper growth and development. This profile includes Dried Urine tests for: Iodine, Bromine, Lithium, Selenium, Arsenic, Cadmium, Mercury and Creatinine.

Steroid hormones in the bloodstream are 95-99% bound to carrier proteins, and in this form are unavailable to target tissues. Saliva testing measures the amount of hormone available to target tissues – the bioavailable amount. For this reason, saliva testing better relates to specific symptoms of excess or deficiency, and is a good option for monitoring hormone therapy.

Neurotransmitters are chemical messengers used by the nervous system to relay information from one nerve to another. Optimal neurotransmitter balance is required to maintain proper health. Imbalances can cause the brain and the body to be over- or under-stimulated, producing neurological or psychological symptoms. Genetics, environment, chemicals and nutritional deficiencies are a few factors that can impact neurotransmitter production. Once out of balance, the nervous system begins to compensate – which, in time, can lead to neurological or psychological symptoms. Some of the more common psychological conditions today are known to be accompanied by neurotransmitter imbalances. However, it’s also possible for individuals to present with similar symptoms yet have unique foundational imbalances. Testing helps clarify these root issues. Common neurotransmitter-related causes of health issues often involve the following scenarios: Anxiety & Depression Neurotransmitter imbalances are often associated with anxiety and depression, specifically Glutamate (panic attacks), PEA, Histamine, Serotonin, as well as Epinephrine & Norepinephrine. Chronic Fatigue An imbalance between excitatory and inhibitory neurotransmitters can lead to persistent fatigue. Impulsivity GABA, Dopamine and Serotonin are three chemical messengers commonly linked to disorders like ADD, ADHD & OCD. Insomnia Imbalances in Glutamate, Histamine, Dopamine, GABA and Serotonin are often linked to sleep disturbances and insomnia. PMS or PMDD Imbalances in Serotonin, Dopamine, Norepinephrine and GABA are often involved in cases of PMDD (pre-menstrual dysphoric disorder) and severe PMS.