Estradiol (E2) – sensitive / LC-MS/MS method

The estradiol test using liquid chromatography–tandem mass spectrometry (LC-MS/MS) measures the precise concentration of estradiol in the blood. This is the most sensitive and specific method for assessing estrogen levels. Estradiol (17-beta-estradiol, E2) is the biologically active form of estrogen — the main female sex hormone. In women, it is primarily produced by the ovaries, and to a lesser extent by the adrenal glands and adipose tissue. During pregnancy, estradiol is also synthesized by the placenta. In men and children, estradiol is produced in small amounts, mainly through peripheral aromatization of androgens.

Features of the Method:

• Uses tandem mass spectrometry combined with liquid chromatography, providing exceptional accuracy even at very low hormone concentrations.
• Not subject to false-positive results from cross-reactivity with other estrogens, as may occur in immunoassays.
• Considered the gold standard for measuring estradiol in men, children, postmenopausal women, and patients on hormone replacement therapy (HRT).
• Also used in scientific and clinical settings requiring precise hormonal quantification.

When Is This Test Recommended?

Your doctor may recommend the LC-MS/MS estradiol test in cases such as:

• Suspected hormonal imbalance in men (e.g., gynecomastia, testicular tumors)
• Evaluation of sexual development in boys and girls (precocious or delayed puberty)
• Monitoring of estrogen therapy in postmenopausal women or transgender patients
• Assessment of ovarian reserve, fertility, or conditions where accurate detection of low estradiol is essential
• Diagnosis of hormone-producing tumors

🔍 Typical Reference Ranges (approximate):

• Men: < 40 pg/mL
• Women, follicular phase: 20–160 pg/mL
• Ovulatory peak: 150–480 pg/mL
• Luteal phase: 40–250 pg/mL
• Postmenopausal (without HRT): < 10 pg/mL
• Postmenopausal (with HRT): varies depending on therapy

🔷 What Does a High E2 Level Indicate?

• Precocious puberty
• Estrogen-producing tumors (ovaries, testes, adrenal glands)
• Gynecomastia in men
• Hyperthyroidism
• Use of estrogen-containing medications

🔷 What Does a Low E2 Level Indicate?

• Ovarian insufficiency or early menopause
• Anovulation and infertility
• Low estrogen levels in transgender patients during early treatment
• Osteopenia and increased fracture risk
• Suppressed hormone production due to pituitary dysfunction or extreme weight loss