Sex effects on TH serum parameters were observed for TT4 and fT4 under hyperthyroidism (TT4: F(1,28) = 20.50, p = 0.0001; fT4: F(1,28) = 10.80, p = 0.0027) but not for hypothyroidism (TT4: F(1,28) = 0.09858, fT4: p = 0.7559; F(1,28) = 0.2127, p = 0.6482) and not for fT3 (hyperthyroid: F(1,28) = 2.485, p = 0.1261; hypothyroid:F(1,28) = 0.1553, p = 0.6965). Here, TH is linked to hyperthyroidism.