CHI3L1 and polycystic ovary syndrome: Furthermore, there is a significant difference in Chi3l1 levels between women with PCOS and abnormal glucose tolerance (AGT-PCOS; 169.14 ± 36.1 μg/L) compared with women with PCOS and normal glucose tolerance (NGT-PCOS; 147.7 ± 41.9 μg/L), which may be beneficial in predicting abnormal glucose tolerance in patients with PCOS [281].