How are TSH Schilddrüse and fertility related?

TSH (thyroid-stimulating hormone) is a key marker of thyroid function, and both hypothyroidism and hyperthyroidism are strongly linked to fertility issues. In women, elevated TSH can disrupt ovulation, impair endometrial receptivity, and increase miscarriage risk. Optimal TSH for conception is often considered <2.5 mIU/L, though guidelines vary. In men, thyroid dysfunction can reduce sperm motility and morphology. The evidence is robust, based on large cohort studies and meta-analyses (evidence level: human-strong). TSH testing is a standard part of fertility workups. However, a single finger-prick TSH value is not diagnostic; confirmatory lab testing and clinical evaluation are needed. Other hormones (cortisol, prolactin, sex hormones) also play a role. Treatment of thyroid disorders (e.g., levothyroxine) can improve fertility outcomes. Note: Self-interpretation without medical context is risky.