Endocrine Abstracts

Testosterone levels in normally cycling women are generally assumed to be elevated during ovulation. The clinical relevance of changing testosterone levels during the menstrual cycle, however, is unclear, due to poor performance of current direct immunoassays for testosterone at low concentrations.An isotope dilution-liquid chromatography–tandem mass spectrometry (ID-LC–MS/MS) method with sufficient reliability and sensitivity1 was u...