An isotope dilution-liquid chromatography-tandem mass spectrometry-based candidate reference measurement procedure for the quantification of 5-alpha-dihydrotestosterone in human serum and plasma. - Lewin L; Stadlmeier M; Singh N; Bauland F; Köppl D; Gaudl A; Geistanger A; Ceglarek U; Rauh M; Taibon J (Clinical chemistry and laboratory medicine, 2026)