The univariate regression analysis showed that the risk of PCOS increased 1.556 times when cystatin C increased by one unit, the risk of PCOS increased 5.815 times when hs-CRP increased by one unit, and the risk of PCOS increased 1.561 times when NLR increased by one unit (p < 0.001, p < 0.001 and p = 0.003; respectively). The gene discussed is CST3; the disease is polycystic ovary syndrome.