Intensive Care Medicine

, Volume 36, Issue 11, pp 1914–1922 | Cite as

Initial observations regarding free cortisol quantification logistics among critically ill children

Pediatric Original

Abstract

Purpose

Corticosteroid insufficiency may occur among critically ill patients, but the diagnosis remains controversial. Historically assessment of free cortisol (FC) by means of equilibrium dialysis (ED) has required large blood volumes and prolonged fractionation time preceding analysis. We hypothesized that temperature-controlled centrifugal ultrafiltration with chemiluminescence immunoassay (CU/CI) would provide real-time FC data that highly correlated with ED/radioimmunoassay (ED/RI) or liquid chromatography/mass spectrometry (LC/MS) techniques.

Methods

We quantified and correlated baseline and corticotropin-stimulated TC and FC by means of CU/CI, ED/RI, and LC/MS among healthy adults and 37 critically ill children.

Results

Among critically ill children, FC was three- to fivefold higher than the healthy adults at baseline and increased another five- to eightfold following corticotropin administration. While TC increased approximately twofold following corticotropin administration, FC increased on average more than eightfold. Serum FC per CU/CI highly correlated with FC per ED/RI or LC/MS, but results were available in a fraction of the time. Children failing to increase TC by >9.0 μg/dL (248 nM) following corticotropin demonstrated an appropriate FC increase. Nearly 50% of critically ill children exhibited FC <2.0 μg/dL (55 nM). Neither FC nor TC concentrations correlated significantly with measures of illness severity.

Conclusions

Quantification of FC utilizing CU/CI was fast (1–2 h) and results correlated highly with ED/RI or LC/MS methodologies. These data require validation with larger cohorts of healthy and critically ill children but indicate that real-time FC quantification is available to guide cortisol replacement therapy.

Keywords

Total cortisol Free cortisol Equilibrium dialysis Centrifugal ultrafiltration Radioimmunoassay Chemiluminescence immunoassay Liquid chromatography/mass spectrometry Critical illness related cortisol insufficiency Relative adrenal insufficiency 

Notes

Acknowledgments

Partial salary support for Zimmerman and Barker provided by U10 HD049945, Eunice Kennedy Shriver NIH/NICHD, Collaborative Pediatric Critical Care Research Network. This work was presented in abstract form at the Society of Critical Care Medicine, 37th Critical Care Congress, Honolulu, HI, 2/3/2008. Crit Care Med 2007;35(Suppl):A132 (abstract 483).

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Copyright information

© Copyright jointly held by Springer and ESICM 2010

Authors and Affiliations

  • Jerry J. Zimmerman
    • 1
    • 3
  • Ruth M. Barker
    • 1
  • Rhona Jack
    • 2
  1. 1.Department of Pediatrics, Division of Critical Care MedicineSeattle Children’s Hospital, University of Washington School of MedicineSeattleUSA
  2. 2.Department of Pathology and Laboratory MedicineSeattle Children’s Hospital, University of Washington School of MedicineSeattleUSA
  3. 3.Pediatric Critical Care MedicineSeattle Children’s HospitalSeattleUSA

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