Specimen Requirements
Title
Methotrexate, Serum
Specimen Requirement
Patient Preparation:
Collect 24, 48, or 72 hours after dose. Record hours from last dose on specimen container.
Collection Instructions:
Collect red top, lavender EDTA or heparin tube, immediately protect from light, centrifuge and send 1.0 mL serum or plasma in an amber screw top plastic vial, indicate sample type on tube and send same day collected.
Protect from light. Ship Monday-Thursday only.
Methodology
Immunoassay (IA)
Stability
Room temp: 24 hours, Refrigerated: Unacceptable, Frozen: 5 days
Reference Range
The reference range is determined by the performing laboratory and will show on the report.
Turnaround
2-3 days performed Monday-Saturday
Clinical Use
Test Code
MTXM