Evaluation of the Performance of an Automated Chemiluminescent Method (Access Beckman Coulter) for Determination of Salivary Cortisol and Clinical Utility
American Journal of Clinical and Experimental Medicine
Volume 7, Issue 6, November 2019, Pages: 130-134
Received: Oct. 29, 2019; Accepted: Nov. 20, 2019; Published: Dec. 6, 2019
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Authors
Maria Alejandra Kloberdanz, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Lucia Fernandez, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Agustina Peverini, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Fernando Smithuis, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Adrian Aymard, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Claudio Aranda, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina
Bibiana Fabre, Clinical Biochemistry Department, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, CABA, Argentina
Martin Repetto, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina; Clinical Biochemistry Department, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, CABA, Argentina
Adriana Oneto, Laboratory of Clinical Analysis of Buenos Aires (TCba-LACba), CABA, Argentina; Clinical Biochemistry Department, Faculty of Pharmacy and Biochemistry, INFIBIOC, University of Buenos Aires, Buenos Aires, CABA, Argentina
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Abstract
The diagnostic procedure for the evaluation of Cushing’s syndrome is performed by any of the following biochemical tests: urine free cortisol, salivary cortisol at 11 pm and serum cortisol post 1 mg of dexamethasone. Collection of saliva samples is simple and noninvasive, thus being a method of choice for the evaluation of risk populations. The aim of this work is to analyze the performance of an automated chemiluminescent method for measurement of salivary cortisol at 11 pm according to the new quality guidelines and assess its clinical utility. Cortisol levels were measured in samples obtained by passive drooling from 32 healthy subjects and 9 patients with Cushing’s syndrome. Matrix effect, linearity, limit of blank, limit of quantitation, recovery and diagnostic performance were assessed. The Unicel 600 DXI Access Beckman Coulter chemiluminescent automated analyzer was used. The standard curve provided by the manufacturer was adapted to measure cortisol concentrations in saliva. Matrix effect: equation of the curve using salivary matrix: y=-1.824x+3.491 (95% CI=-2.068 to -1.582) vs. Equation of the curve using diluent matrix: y=-1.833x+3.394 (95% CI=-1.961 to -1.704). There is overlapping of both curves. Linearity: linear assay between 1.8 nmol/L and 108.0 nmol/L. Limit of blank: 0.1 nmol/L. Limit of quantitation: 1.8 nmol/L (TAE of 25%). Recovery: standard cortisol solution concentration 5 nmol/L: 102%; 10 nmol/L: 107%; 40nmol/L: 115%. Diagnostic performance: median and ranges in healthy subjects: 2.0 nmol/L (<2.0-9.0 nmol/L); Cushing’s syndrome: 30.3 nmol/L (15.4-61.0 nmol/L). ROC curve cutoff value: 9.0 nmol/L (100% Specificity; 100% Sensitivity; AUC=1.00). The method used provides excellent analytical performance for cortisol measurement in saliva at 11 pm, which makes it a valuable biochemical tool both for screening populations at risk for Cushing’s syndrome and for the follow-up and diagnosis of this condition.
Keywords
Salivary Cortisol, Cushing´s Syndrome, Analytical Performance
To cite this article
Maria Alejandra Kloberdanz, Lucia Fernandez, Agustina Peverini, Fernando Smithuis, Adrian Aymard, Claudio Aranda, Bibiana Fabre, Martin Repetto, Adriana Oneto, Evaluation of the Performance of an Automated Chemiluminescent Method (Access Beckman Coulter) for Determination of Salivary Cortisol and Clinical Utility, American Journal of Clinical and Experimental Medicine. Vol. 7, No. 6, 2019, pp. 130-134. doi: 10.11648/j.ajcem.20190706.12
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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