NameCortisol (CORT)
Tube TypeSerum (Gold top)
Reporting Unitsnmol/L
Reference RangeAll agesInterpretation of serum cortisol tested at 9am:

Cortisol <170 suggestive of adrenal insufficiency.

Cortisol >320 adrenal failure unlikely if no symptoms.

Cortisol >420 usually excludes adrenal insufficiency.

Analytical Range3 – 17500
AvailabilityNDDH (24/7)
Target turnaround time6 hours
Special requirements & notesIndicate time of blood sample

Note medications

Patient preparationIf taking supplements, do not take in the 8 hours prior to blood test – may contain agents which affect the analysis
Volume required1 tube (4ml)
If delayed transport to lab, store:Centrifuged, in refrigerator
Factors affecting result interpretationTime of sampling
Time limit for add on test4 days
Pathology disciplineBiochemistry
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Posted in Assay.

Last updated: June 6, 2019