Charlotte Michaela Fries1, Yoon Ju Bae2, Nada Rayes3, Benjamin Sandner1, Berend Isermann2, Michael Stumvoll1, Valentina Fagotto4, Martin Reincke4, Martin Bidlingmaier4, Vogel Mandy5, Jürgen Kratzsch2, Wiebke Kristin Fenske1,6. 1. Medical Department III, Endocrinology, Nephrology, Rheumatology, University Hospital of Leipzig, Leipzig, Germany. 2. Institute of Laboratory Medicine, Clinical Chemistry, and Molecular Diagnostics, University of Leipzig, Leipzig, Germany. 3. Endocrine Surgery, Department for Visceral, Transplant, Thoracic and Vascular Surgery, University Hospital of Leipzig, Leipzig, Germany. 4. Department of Medicine IV, Klinikum der Universität, Ludwig-Maximilians-Universität, München, Germany. 5. Leipzig Research Center for Civilization Diseases (LIFE Child), University of Leipzig, Leipzig, Germany. 6. Integrated Research and Treatment Centre for Adiposity Diseases, Department of Medicine, University of Leipzig, Leipzig, Germany.
Abstract
OBJECTIVE: Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) has become state of the art for the quantitative analysis of steroid hormones. Although method comparisons show that aldosterone measurement using LC-MS/MS yields considerably lower levels than immunoassays (IAs), method-specific cutoff values for primary aldosteronism (PA) are largely missing. Objective of this study was to analyze the diagnostic accuracy of proposed LC-MS/MS-specific cutoff values for the saline infusion test (SIT). DESIGN AND METHODS: From 2016 to 2019, 104 consecutive patients suspected of PA underwent the SIT and captopril challenge test in the tertiary medical center at the University Hospital of Leipzig, Germany. Patients with positive case confirmation underwent adrenal imaging and adrenal venous sampling for subtype classification. RESULTS: Overall, proposed assay-specific PACLC-MS/MS cutoff values for the SIT achieved higher diagnostic accuracy than established PACIA values with a sensitivity and specificity of 87.5% (95% CI: 71.0-96.5) and 97% (95% CI: 89.6-99.6) for a cutoff of 120 pmol/L and 93.8% (95% CI: 79.2-99.2) and 92.5% (95% CI: 83.4-97.5) for a cutoff of 94 pmol/L. The most accurate post-SIT PACLC-MS/MS cutoff value in this study was 83 pmol/L, yielding a sensitivity and specificity of 96.9% (95% CI: 83.8-99.9) and 92.5% (95% CI: 83.4-97.5), respectively. CONCLUSIONS: The present data confirm the need for the implication of lower method-specific aldosterone cutoff values for the diagnosis of PA with LC-MS/MS based aldosterone measurement.
OBJECTIVE: Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) has become state of the art for the quantitative analysis of steroid hormones. Although method comparisons show that aldosterone measurement using LC-MS/MS yields considerably lower levels than immunoassays (IAs), method-specific cutoff values for primary aldosteronism (PA) are largely missing. Objective of this study was to analyze the diagnostic accuracy of proposed LC-MS/MS-specific cutoff values for the saline infusion test (SIT). DESIGN AND METHODS: From 2016 to 2019, 104 consecutive patients suspected of PA underwent the SIT and captopril challenge test in the tertiary medical center at the University Hospital of Leipzig, Germany. Patients with positive case confirmation underwent adrenal imaging and adrenal venous sampling for subtype classification. RESULTS: Overall, proposed assay-specific PACLC-MS/MS cutoff values for the SIT achieved higher diagnostic accuracy than established PACIA values with a sensitivity and specificity of 87.5% (95% CI: 71.0-96.5) and 97% (95% CI: 89.6-99.6) for a cutoff of 120 pmol/L and 93.8% (95% CI: 79.2-99.2) and 92.5% (95% CI: 83.4-97.5) for a cutoff of 94 pmol/L. The most accurate post-SIT PACLC-MS/MS cutoff value in this study was 83 pmol/L, yielding a sensitivity and specificity of 96.9% (95% CI: 83.8-99.9) and 92.5% (95% CI: 83.4-97.5), respectively. CONCLUSIONS: The present data confirm the need for the implication of lower method-specific aldosterone cutoff values for the diagnosis of PA with LC-MS/MS based aldosterone measurement.
Authors: Alexander A Leung; Christopher J Symonds; Gregory L Hundemer; Paul E Ronksley; Diane L Lorenzetti; Janice L Pasieka; Adrian Harvey; Gregory A Kline Journal: Hypertension Date: 2022-06-02 Impact factor: 9.897