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HelpTest Code ONDST Overnight Dexamethasone Suppression Test
Additional Codes
| Epic Ordering Code | LAB3040367 |
| NBS code | LBC00252 |
| Service code | 31721 |
Specimen Requirements
Submit the following:
| Container: |
| Yellow Top |
Additional information: For patients on dexamethasone, confirm/note time of administration before sample collection.
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
Reference interval not available for this test.
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Update
Last updated 26/07/2026
LOINC Code Information
Not available