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HelpTest Code 25OHD Vitamin D 25-Hydroxy
Additional Codes
| Epic Ordering Code | LAB535 |
| NBS code | LBC00007 |
| Service code | 31036 |
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 | 72 hours |
| Refrigerate | 12 days |
| Frozen | 1 year |
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | Alert/Reject |
| Others | Not applicable |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| Deficient | ≤ 20 ug/L |
|---|---|
| Insufficient | 21 – 29 ug/L |
| Sufficient | 30 – 100 ug/L |
| Possible toxicity | > 100 ug/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Diagnosis of vitamin D deficiency and hypervitaminosis D.
Monitoring vitamin D replacement therapy
Update
Last updated 28/07/2026
LOINC Code Information
1989-3
Alias
25-OH Vitamin D2 and D3, Serum