Variability of cortisol assays can confound the diagnosis of adrenal insufficiency in the critically ill population.

Abstract:

OBJECTIVE:To compare the total plasma cortisol values obtained from three widely used immunoassays and a high pressure liquid chromatography (HPLC) technique on samples obtained from patients with sepsis. DESIGN AND SETTING:Observational interventional in the general intensive care unit of a metropolitan hospital PATIENTS AND PARTICIPANTS:Patients admitted to the intensive care unit with a diagnosis of sepsis and fulfilling criteria of systemic inflammatory response syndrome. INTERVENTIONS:Standard short synacthen test performed with 250microg cosyntropin. MEASUREMENTS AND RESULTS:Two of the three immunoassays returned results significantly higher than those obtained by HPLC: Immulite by 95% (95%CI 31-188%) and TDx by 79% (21-165%). The limits of agreement for all three immunoassays with HPLC ranged from -62% to 770%. In addition, by classifying the patients into responders and non-responders to ACTH by standard criteria there was concordance in all assays in only 44% of patients. CONCLUSIONS:Immunoassay estimation of total plasma cortisol in septic patients shows wide assay related variation that may have significant impact in the diagnosis of relative adrenal insufficiency.

journal_name

Intensive Care Med

journal_title

Intensive care medicine

authors

Cohen J,Ward G,Prins J,Jones M,Venkatesh B

doi

10.1007/s00134-006-0389-x

subject

Has Abstract

pub_date

2006-11-01 00:00:00

pages

1901-5

issue

11

eissn

0342-4642

issn

1432-1238

journal_volume

32

pub_type

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