At the AMH threshold of 8.173 ng/mL, the sensitivity equals 90.00% (95% CI: 69.90% to 98.22%), and specificity is 97.26% (95% CI: 90.55% to 99.51%), indicating that at this level, 90% of women with PCOS can be correctly identified, while 97.26% of women without PCOS would be correctly classified if their AMH level is below 8.173 ng/mL. The gene discussed is AMH; the disease is polycystic ovary syndrome.