There are no relationships between PCOS and other serological indicators: estimated glomerular filtration rate (-0.803, 95% CI, 0.470-1.371; P = 0.421), β2-microglobulin (1.233, 95% CI, 0.850-1.791; P = 0.270), urinary albumin-to-creatinine ratio (0.994, 95% CI, 0.925-1.067; P = 0.861) (Figure 2). Here, HLA-G is linked to polycystic ovary syndrome.