During pregnancy, estrogen levels, including estradiol, rise steadily toward term. The source of these estrogens is the placenta, which aromatizes prohormones produced in the fetal adrenal gland. We'll walk you through typical estradiol levels at different ages and life stages, plus what to know if your levels are running a little high or low. Estrogen levels naturally fluctuate during different life stages and your menstrual cycle. Consistently high or low levels of estrogen may signal a condition that requires your healthcare provider’s attention. Normal estradiol levels by age range from around 15-350 pg/mL during peak reproductive years down to below 10 pg/mL after menopause. Estradiol (E2) is the main estrogen measured in blood tests, and knowing your number can help explain symptoms like irregular periods, hot flashes, or bone loss. Estradiol drives reproductive development, regulates the menstrual cycle, supports bone density, influences mood and cognition, and affects cardiovascular health. An estradiol blood test measures the E2 concentration in your serum. Learn about estradiol levels, their role in hormonal health, and how an estradiol blood test can diagnose imbalances. Find out normal ranges, symptoms, and treatment options. Estradiol levels vary by age. Learn normal estradiol levels by age with easy-to-read charts and what low estradiol means for women and men. Learn how to interpret estradiol levels in your blood test. Uncover valuable insights into overall health and well-being. Below is a general reference chart showing typical estradiol (E2) blood levels in picograms per milliliter (pg/mL) for women in different age and reproductive stages. Find out what normal estradiol levels by age should look like, how they vary by gender, and what high or low levels might mean for your health.