In the PCOS patients, serum PRL was significantly and positively correlated with FPG, serum TSH, and serum FT4, and significantly and negatively correlated with LH, LH/FSH, TC, TG, LDL-C, AST, ALT, γ-GGT, FT3, and FT3/FT4 (p < 0.05 or 0.01). Here, PRL is linked to polycystic ovary syndrome.