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HelpTest Code Methotrexate Methotrexate
Additional Codes
| Epic Ordering Code | LAB481 |
| NBS code | LBC08017 |
| Service code | 31819 |
Specimen Requirements
Submit the following:
| Container: |
| Dark Green Top (Li Heparin) |
Additional information: Protect sample from light with aluminium foil and send to the Laboratory immediately.
Processing Requirements
Centrifuge within 2 hours.
Specimen type: Plasma
Volume: 0.5 mL
Additional information: For specimens collected outside NUH, aliquot the plasma into a secondary tube. Protect the specimen from light with aluminium foil, and send it frozen to the laboratory.
Specimen Stability
| Specimen Type | Plasma |
|---|---|
| Ambient | 1 day |
| Refrigerate | 2 days |
| Frozen | 6 months (Preferred) |
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others: Specimens not protected from light | Reject |
Methodology
Chemiluminescent Immunoassay
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| Post treatment | 5.00 – 10.00 umol/L |
|---|---|
| 24 – 48 hrs | 0.50 – 1.00 umol/L |
| 48 – 72 hrs | < 0.20 umol/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Therapeutic drug monitoring.
Update
Last updated 26/07/2026
LOINC Code Information
14836-1