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HelpTest Code COR Cortisol, serum
Additional Codes
| Epic Ordering Code (random) | LAB61 |
| Epic Ordering Code (8 am) | LAB520 |
| Epic Ordering Code (12 midnight) | LAB3040846 |
| NBS code | LBC00252 |
| Service code | 31721 |
Specimen Requirements
Submit the following:
| Container: |
| Yellow Top |
Processing Requirements
Allow specimen to clot for 30 mins and centrifuge within 2 hours
Specimen type: Serum
Volume: 0.5mL
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
Serum cortisol is time dependent.
Paediatric:
| Age | |
|---|---|
| 2 – 14 days | 13 – 340 nmol/L |
| 15 days – < 1 yr | 14 – 458 nmol/L |
| 1 yr – 8 yrs | 48 – 297 nmol/L |
| 9 – 13 yrs | 61 – 349 nmol/L |
| 14 – 16 yrs | 77 – 453 nmol/L |
| 17 – 18 yrs | 97 – 506 nmol/L |
Adult:
Cortisol 8am: 102 - 535 nmol/L
Cortisol 12 Midnight: 80 - 477 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.
Update
Last updated 16/07/2026
LOINC Code Information
| Cortisol, random | 83090-1 |
| Cortisol, 8am | 45050-2 |
| Cortisol, 12 midnight | 45047-8 |