Estradiol (male)
Part of Hormone & Urinary Metabolites Assessment Profile, Doctor's Data

Estradiol level is most consistent with exogenous exposure, supplementation, or aromatization of testosterone to estradiol. CYP19, also known as aromatase, can be upregulated raising intracellular estrogens in men which can contribute to increased adiposity, metabolic syndrome, and prostate pathology. CYP19 enzyme is induced during times of stress, exposure to xeno-estrogens, high glycemic diet, excessive adipose tissue, and alcohol consumption.

Optimal range 0.4 – 2 ng/mg Creat/Day Learn more
Estradiol (male)
Urine
Part of ZRT Laboratory (Urinary Neurotransmitters), ZRT Laboratory

Estradiol, a crucial estrogen hormone, is not only significant in female physiology but also plays a vital role in male health, as evidenced by its inclusion in the ZRT Laboratory Urinary Neurotransmitters panel. In men, estradiol is derived from the conversion of testosterone and is essential for modulating libido, erectile function, and spermatogenesis. The balance of estradiol in men is critical; levels that are too high or too low can lead to various health issues. High estradiol in males can cause symptoms like gynecomastia (breast tissue development), weight gain, and emotional disturbances, while low levels might result in decreased bone density and libido. The urinary neurotransmitter panel by ZRT Laboratory is an innovative tool that aids in the comprehensive assessment of a patient's neurotransmitter and hormone levels, including estradiol, providing valuable insights into an individual's overall neuroendocrine status. This can be particularly useful for healthcare professionals in diagnosing and managing conditions related to hormonal imbalances in men. Understanding estradiol levels through such advanced diagnostic methods is essential in developing effective treatment strategies for hormonal issues in males, ensuring better health outcomes.

Optimal range 0.18 – 0.49 ug/g Cr Learn more
Estradiol, Free (Male)
Part of Endocrinology

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.

Optimal range 0 – 0.45 pg/mL Learn more
Estradiol, ultrasensitive, LC/MS (Male)
Part of Endocrinology

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.

Optimal range 0 – 29 pg/mL Learn more