How are TSH and Fruchtbarkeit related?

TSH (thyroid-stimulating hormone) is a key regulator of thyroid function. Both hypothyroidism (high TSH) and hyperthyroidism (low TSH) can impair fertility. In women, elevated TSH disrupts ovulation, causes menstrual irregularities, and increases miscarriage risk. In men, thyroid dysfunction can reduce sperm quality and libido. The evidence is strong (human-strong) from clinical studies and guidelines; TSH testing is standard in fertility workups. However, TSH alone is not diagnostic – full thyroid panel (fT3, fT4, antibodies) and clinical context are needed. Consumer DNA tests for TSH-related genes lack predictive value for fertility. If TSH is abnormal, consult an endocrinologist or reproductive specialist. Lifestyle factors (iodine, stress, sleep) also modulate thyroid function.