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HelpTest Code Methotrexate Methotrexate
Additional Codes
| Epic Ordering Code | LAB481 |
| NBS code | LBC08017 |
| Service code | 31819 |
Specimen Requirements
Submit only one of the following immediately:
Container/Tube: Green Top (Li Heparin)
Processing Requirements
Protect specimen from light by wrapping the container/tube with aluminium foil.
Specimen type: Plasma
Volume: 0.5 mL
Storage/transport requirements: Refrigerated
Specimen Stability
| Specimen Type | Plasma |
|---|---|
| Ambient | 1 day |
| Refrigerate | 2 days |
| Frozen | 6 months |
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.
LOINC Code Information
14836-1
Update
Last updated 09/04/2026