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 Mu, B.S., Jiadan Fang, M.S., Songlin Yu, M.S., Yichen Ma, B.S., Jin Cheng, M.S., Yingying Hu, B.S., Ailing Song, B.S., Fang Zhao, B.S., Qi Zhang, M.S., Zhihong Qi, M.S., Kui Zhang, B.S., Liangyu Xia, M.S., Ling Qiu, M.S., Huijuan Zhu, Ph.D., and Xinqi Cheng, Ph.D.. Ann Lab Med 2024;44:29-37. https://doi.org/10.3343/alm.2024.44.1.29