Comparison of Direct and Extraction Immunoassay Methods With Liquid Chromatography-Tandem Mass Spectrometry Measurement of Urinary Free Cortisol for the Diagnosis of Cushing's Syndrome.
Danni MuJiadan FangSonglin YuYichen MaJin ChengYingying HuAiling SongFang ZhaoQi ZhangZhihong QiKui ZhangLiangyu XiaLing QiuHuijuan ZhuXinqi ChengPublished in: Annals of laboratory medicine (2023)
Commercially available immunoassays for measuring UFC show different levels of analytical consistency compared to LC-MS/MS. Abbott-D, Siemens-E, and Beckman-E have high diagnostic accuracy for CS.