What to watch with Östradiol and Fruchtbarkeit?

The question about estradiol and fertility is important but broad. Estradiol is the primary estrogen and crucial for follicular development, ovulation, and endometrial preparation. Both low and high levels can impair fertility. However, a single measurement is rarely diagnostic because estradiol fluctuates throughout the menstrual cycle and is influenced by age, stress, diet, and underlying conditions. The provided context does not contain specific evidence linking estradiol to fertility; it includes information on TSH self-tests, IgG food intolerance tests, and DNA tests for athletic performance, none of which directly address this topic. Therefore, any answer must be conservative: monitor estradiol only as part of a comprehensive fertility workup under medical supervision. Self-testing or isolated interpretation is not recommended. Evidence level: practice (general medical knowledge), not supported by the given context. Sources: none from context.