This module covers the role of laboratory investigations in assessing PCOS, hormonal imbalances, metabolic health, and nutritional status. It explores the appropriate timing and interpretation of reproductive hormones, androgen profiles, AMH, thyroid, metabolic, inflammatory, and nutritional biomarkers. The module also focuses on correlating lab findings with clinical symptoms and menstrual history. It highlights the identification of different PCOS patterns to support personalized nutrition and lifestyle planning.