Serum hormones and seminal parameters in males with thyroid disturbance.

Semen characteristics and serum levels of the hormones T3, T4, fT4, TSH, FSH, LH, Prolactin and Testosterone have been measured in five men with thyroid disorders (two patients had primary hypothyroidism, two had Graves disease and one had subacute thyroiditis). Alteration in thyroid status negatively affects semen quality, more markedly in hypothyroidism than in hyperthyroidism. Treatment of patients improves the quality of semen.