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HelpTest Code COR8 Cortisol, serum, 8am
Specimen Requirements
Specimen Type: Serum
Container/Tube: Gold Top (SSTII)
Volume: 5.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 14 days |
| Frozen | 30 days |
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
102 – 535 nmol/L
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Differential diagnosis of Cushing syndrome.
Screening and diagnosis of primary and secondary adrenal insufficiency.
Service Code
31721
Update
Last updated 10/03/2025
Laboratory Code
LAB520
LOINC Code Information
45050-2