In men, levels of testosterone begin to decline with age, usually beginning around the mid-40s. The decline in testosterone production by the testes can be more precipitous in some men than others.

Excessive weight gain, stress, lack of exercise, and many medications can further reduce testosterone levels, leading to symptoms that include low libido, irritability, depression, loss of muscle mass and strength, weight gain, erectile dysfunction, osteoporosis, and adverse changes in the blood lipid profile.

Testosterone levels in saliva are an accepted method for assessment of hypogonadism in men.

In women, high testosterone, often caused by ovarian cysts, leads to conditions such as excessive facial and body hair, acne, and oily skin and hair.

Low testosterone in postmenopausal women, seen particularly after surgical removal of the ovaries, leads to female symptoms of androgen deficiency including loss of libido, thinning skin, vaginal dryness, and loss of bone and muscle mass.

Testing testosterone levels in women through dried urine tests is an effective and convenient method for assessing hormonal balance. 

Testosterone is typically associated with men, but women also produce this hormone in smaller quantities. It plays a crucial role in women's health, affecting mood, energy, libido, and muscle mass.

Testosterone is an androgenic sex steroid/hormone that helps maintain libido, influences muscle mass and weight loss, and plays a role in the production of several other hormones. During the aging process, testosterone levels gradually decline in both sexes, which can lead to loss of bone density. Testosterone concentrations tend to be higher in men versus women.

Testosterone is an anabolic hormone produced predominately by the ovaries in women and the testes in men, and to a lesser extent in the adrenal glands. It is essential for creating energy,  maintaining optimal brain function (memory), regulating the immune
system, and building and maintaining the integrity of structural tissues such as skin, muscles, and bone. Premenopausal testosterone levels usually fall within the high-normal range and postmenopausal levels at low-normal range. In men testosterone levels peak in the teens and then fall throughout adulthood.

In the adult male, testosterone maintains the structure and function of the prostate, testes, seminal vesicles, and external male genitalia. In addition, testosterone affects lean body mass, bone density, hematopoiesis, libido and mood.

Testosterone levels in saliva are an accepted method for assessment of hypogonadism in men. In women, high testosterone, often caused by ovarian cysts, leads to conditions such as excessive facial and body hair, acne, and oily skin and hair. Low testosterone in postmenopausal women, seen particularly after surgical removal of the ovaries, leads to female symptoms of androgen deficiency including loss of libido, thinning skin, vaginal dryness, and loss of bone and muscle mass.

Testosterone is the major androgen in the body. It is converted to dihydrotestosterone by 5-alphareductase, and to estradiol by aromatase.

Testosterone is the major androgen in the body. It is converted to dihydrotestosterone by 5-alphareductase, and to estradiol by aromatase.

Testosterone is a male sex hormone or androgen. It is generally low in women and children, but it can be elevated in certain diseases. A certain level of testosterone is important for development and maturation in both genders.

Testosterone is the major androgen in the body. It is converted to dihydrotestosterone by 5-alphareductase, and to estradiol by aromatase.

Testosterone is the major androgen in the body. It is converted to dihydrotestosterone by 5-alphareductase, and to estradiol by aromatase.

Testosterone, the primary male sex hormone, is a vital marker in the Comprehensive 24-Hour Urine Steroid Hormone Profile Test, signifying its paramount importance in assessing male health and hormonal function. Testosterone plays a crucial role in developing and maintaining male characteristics, influencing muscle mass, bone density, libido, and overall energy levels. In the context of a 24-hour urine test, the measurement of testosterone offers an extensive view of its daily production and metabolism, providing a more accurate reflection of the hormone's activity than a single blood test. This method captures the fluctuations in testosterone levels throughout the day, offering crucial insights into the endocrine system's functioning.

Testosterone, the primary male sex hormone, is a key focus in the ZRT Laboratory Urinary Neurotransmitters panel, highlighting its paramount importance in men's health and endocrinology. This hormone plays a central role in male physiology, influencing muscle mass, bone density, fat distribution, and red blood cell production. Beyond physical attributes, testosterone is critical for libido, sexual function, mood regulation, and cognitive abilities. In men, optimal testosterone levels are essential for overall health and well-being.

In the adult male, testosterone maintains the structure and function of the prostate, testes, seminal vesicles, and external male genitalia. In addition, testosterone affects lean body mass, bone density, hematopoiesis, libido and mood.

Testosterone is the major anabolic androgen found in females. Because urinary testosterone levels are independent of circadian rhythm fluctuation, urine may be a better medium than serum to indicate androgen production.