FST and polycystic ovary syndrome: However, when we compared follistatin concentration between the entire group of women with PCOS and the control group, we detected a significant elevation in the concentrations of follistatin in women with PCOS (median: 1377.78 pg/mL; 1st and 3rd quartile: 1211–1622.22 pg/mL) compared to the control group (median: 1166.67 pg/mL; 1st and 3rd quartile: 988.89–1400.00).