This is a fundamental test for assessing your hormonal health. The Estradiol (E2) test measures the most potent and important form of estrogen in your body. In women, it's essential for regulating the menstrual cycle and supporting pregnancy. This test is a critical tool for investigating irregular periods, infertility, or symptoms of menopause, and it is the key hormone monitored during IVF cycles. In men, it helps investigate hormonal imbalances. A simple blood draw is required. This test provides a clear, quantitative look at a cornerstone of your endocrine health, empowering you to find balance.