Sign in →

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