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Liquid-chromatography tandem mass spectrometry (LC–MS/MS) has become the method of choice in steroid hormone measurement. However, little information on the mutual agreement of LC–MS/MS methods is available. We compared eight routine unpublished LC–MS/MS methods for the simultaneous measurement of testosterone and androstenedione.Sixty random serum samples from male and female volunteers were analysed...
Measurements of fasting levels of insulin and C-peptide are useful in documenting insulin resistance and may help predict development of diabetes mellitus. However, the specific insulin and C-peptide levels associated with specific degrees of insulin resistance have not been defined, owing to marked variability among immunoassays and lack of standardization. Herein, we describe a multiplexed liquid...
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