Cross-sectional and 8-year longitudinal trends of testosterone, other androgens and metabolites, and related hormones in middle-aged men. Abbreviations: AAG, androstanediol glucuronide; DHEA, dehydroepiandrosterone; DHEAS, DHEA sulfate; DHT, dihydrotestosterone; FSH, follicle-stimulating hormone; LH, Luteinizing hormone; T, testosterone. Source: MMAS, Feldman et al, J Clin Endocrinol Metab 2002; 87(2):589–598. 55 Copyright 2002, The Endocrine Society. Used with permission.