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Determination of nighttime salivary cortisol during pregnancy: comparison with values in non-pregnancy and Cushing’s disease

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Abstract

Purpose

Nighttime salivary cortisol (NSC) has been proposed for the diagnosis of Cushing’s syndrome during pregnancy. However, reference values for NCS in pregnant women have not been adequately determined. The aim of this study was to determine the reference values of NSC in the three gestational trimesters in order to help distinguish physiological from pathological hypercortisolism during pregnancy.

Methods

This prospective and retrospective study evaluated 85 pregnant women in whom samples were collected in the first, second and/or third gestational trimester (pregnancy group), 33 non-pregnant women (control group), and 25 non-pregnant women with Cushing’s disease (CD group). NSC was measured by enzyme-linked immunosorbent assay.

Results

NSC increased progressively during pregnancy, reaching maximum levels on the third trimester (median 2.1-fold increase compared with controls, p < 0.001). Reference values for NSC were determined and the upper limits on each gestational trimester were: first trimester 0.25 µg/dL (6.9 nmol/L), second trimester 0.26 µg/dL (7.2 nmol/L), and third trimester 0.33 µg/dL (9.1 nmol/L). Cutoff values that separated the CD group from the three trimesters in the pregnancy groups were, respectively, 0.255 µg/dL (7.0 nmol/L), 0.260 µg/dL (7.2 nmol/L), and 0.285 µg/dL (7.9 nmol/L). Comparison of NSC cutoff values in pregnant women with CD patients showed high sensitivity and specificity in all three trimesters.

Conclusions

We established cutoff values for determination of NSC which can be useful for pregnant women with a diagnostic suspicion of CD.

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Acknowledgments

We would like to thank Milena Braga-Basaria, MD, for the intellectual input and translation of the manuscript into English and Jessica Kantrowitz for proofreading its final version.

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Correspondence to Ludmilla Malveira Lima Lopes.

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The authors report no potential conflict of interest.

Funding

This research did not receive any specific grant from any funding agency in the public, commercial or not-for-profit sector.

Human and Animal Rights and Informed Consent

The study was approved by the Ethics Committee for Analysis of Research Projects of the Clinical Board of Hospital das Clínicas of the School of Medicine, University of São Paulo. All procedures involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. Informed consent was obtained from all participants included in the study.

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Lopes, L.M.L., Francisco, R.P.V., Galletta, M.A.K. et al. Determination of nighttime salivary cortisol during pregnancy: comparison with values in non-pregnancy and Cushing’s disease. Pituitary 19, 30–38 (2016). https://doi.org/10.1007/s11102-015-0680-3

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  • DOI: https://doi.org/10.1007/s11102-015-0680-3

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