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  1. No Access

    Article

    Evaluation and clinical application of a bracketing calibration-based isotope dilution liquid chromatography-tandem mass spectrometry candidate reference measurement procedure for serum theophylline

    A candidate reference measurement procedure (RMP) for serum theophylline via isotope dilution liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed. With a single-step precipitation pretreatm...

    Yuanyuan Du, Qiaofang Yan, Min Zhan… in Analytical and Bioanalytical Chemistry (2024)

  2. No Access

    Article

    Development of matrix-based reference materials for 17 beta-estradiol by the recommended reference method of ID-LC-MS/MS

    We developed and evaluated two-level, namely 2017011 and 2017012, serum-based reference materials (RMs) for 17 beta-estradiol (17 β-E2) by the reference method of isotope dilution liquid chromatography tandem ...

    Haibiao Lin, Dan Liu, Li Deng, Jun Yan… in Analytical and Bioanalytical Chemistry (2023)

  3. No Access

    Article

    Development of human serum matrix-based unconjugated estriol-certified reference material by recommended ID-LC-MS/MS reference method

    To solve long-term lack of traceability of commercial calibrator kits and standardize clinical routine assays, we developed a human serum matrix-based unconjugated estriol (uE3) reference material (RM) with fi...

    Qiaoxuan Zhang, Kai Bai, Meiran Wu, Haibiao Lin… in Analytical and Bioanalytical Chemistry (2022)

  4. No Access

    Article

    An isotope dilution liquid chromatography-tandem mass spectrometry candidate reference measurement procedure for aldosterone measurement in human plasma

    Accurate quantitation of aldosterone is clinically important in standardized testing for primary aldosteronism. The results are often variable when performed by clinical immunoassays. To standardize and ensure...

    Qiaoxuan Zhang, Liqiao Han, Songbai Zheng… in Analytical and Bioanalytical Chemistry (2021)

  5. No Access

    Article

    Evaluation of a bracketing calibration-based isotope dilution liquid chromatography–tandem mass spectrometry candidate reference measurement procedure for 17α-hydroxyprogesterone in human plasma

    A candidate reference measurement procedure (RMP) based on isotope dilution coupled with liquid chromatography–tandem mass spectrometry (ID–LC–MS/MS) was developed and validated for the quantification of 17α-h...

    Qiaoxuan Zhang, Lu Zhang, Haibiao Lin… in Analytical and Bioanalytical Chemistry (2019)

  6. No Access

    Article

    Noninvasive determination of human cortisol and dehydroepiandrosterone sulfate using liquid chromatography-tandem mass spectrometry

    Liquid chromatography-tandem mass spectrometry (LC-MS/MS) for measurements of steroids in human saliva has garnered increased interest in the area of clinical psychoneuroendocrinological research. However, per...

    Zhimin (Tim) Cao, Stephanie E. Wemm, Liqiao Han… in Analytical and Bioanalytical Chemistry (2019)

  7. No Access

    Article

    Liquid chromatography-tandem mass spectrometry analysis of 17-hydroxyprogesterone in dried blood spots revealed matrix effect on immunoassay

    Immunoassays for measuring 17-hydroxyprogesterone (17-OHP) produce high rates of false positives that impact the identification of congenital adrenal hyperplasia (CAH) in neonates. A confirmatory test with hig...

    Liqiao Han, Norma P. Tavakoli, Mark Morrissey… in Analytical and Bioanalytical Chemistry (2019)

  8. No Access

    Article

    Measurement of human serum unconjugated estriol without derivatization using liquid chromatography-tandem mass spectrometry candidate reference method and compared with two immunoassays

    A candidate reference measurement procedure (RMP) for measurement of unconjugated estriol in human serum has been developed and validated. The proposed method is highly reliable and uses isotope dilution coupl...

    **anzhang Huang, Qiaoxuan Zhang, Songbai Zheng… in Analytical and Bioanalytical Chemistry (2018)

  9. No Access

    Article

    Simultaneous quantitation of endogenous estrone, 17β-estradiol, and estriol in human serum by isotope-dilution liquid chromatography–tandem mass spectrometry for clinical laboratory applications

    Estrogen measurements are important in the assessment of female reproductive function and have expanding roles in other fields. A simple, accurate, highly sensitive and specific isotope-dilution liquid chromat...

    Qiaoxuan Zhang, Liqiao Han, Jianbing Wang… in Analytical and Bioanalytical Chemistry (2017)