was ist östrogen — which blood markers matter?

Estrogen refers to a group of primary female sex hormones, mainly estradiol (E2), estrone (E1), and estriol (E3). Estradiol is the most potent and is produced primarily in the ovaries. It regulates the menstrual cycle, bone density, cardiovascular health, and mood. Which blood markers matter depends on the clinical question: For cycle or fertility issues, estradiol (E2) is typically measured alongside FSH, LH, and progesterone. During menopause, estrone (E1) becomes the dominant estrogen and may be more relevant. Estriol (E3) is important mainly during pregnancy. An estrogen ratio (E1/E2/E3) can provide insight into metabolic pathways like aromatase activity or 17β-HSD function. Important caveats: Blood levels fluctuate significantly across the menstrual cycle; a single measurement is often misleading. Environmental xenoestrogens can interfere with assays. Consumer tests like MyBody-X typically only measure estradiol – a useful starting point, but a comprehensive hormone assessment requires a physician or endocrinologist. The evidence for the clinical utility of these markers is human-strong, but interpretation demands expertise.