Test Code MTX Methotrexate, Serum
Performing Laboratory
ChristianaCare-Newark Campus
Methodology
Fluorescence Polarization Immunoassay (FPIA)
Specimen Requirements
Container/Tube: 3.5-mL red-top (gel) tube
Specimen: Full tube
Collection Instructions:
Note: Label tube with patient’s full name and 1 additional unique patient identifier such as date of birth, medical record number, emergency ID number, date and time of draw, collector’s initials, and type of specimen.
Reference Values
Therapeutic range is dosage dependent.
Toxic levels
24 hours post dose: >5.0 mcMOL/L
48 hours post dose: >0.5 mcMOL/L
72 hours post dose: >0.2 mcMOL/L
Day(s) Test Set Up
Monday through Sunday
Routine Turnaround Time: 8 hours
STAT Turnaround Time: 2 hours