Analytical Range:
3 - 1750 nmol/L

Time Limit for Add on Tests:
4 days

Target Turnaround time:
6 hours

Further Information from LabTestsOnline

Tube Type:
Serum (Gold Top)

North Devon District Hospital (24/7)

Interpretation of 9am sample:
Cortisol <170 suggestive of adrenal insufficiency
Cortisol >320 adrenal failure unlikely if no symptoms
Cortisol >420 usually excludes adrenal insufficiency

Special Requirements
Indicate time of sampling
Note medications

Patient preparation:
If taking supplements which contain Biotin (Vitamin B7), do not take in the 8 hours prior to blood test - the concentration present may affect the accuracy of the test.

Last updated: November 19, 2020