METHOTREXATE

Test Documentation
Specimen Required
Draw blood in a plain red-top tube. Centrifuge, separate and send 3.0 mL serum (1.0 mL minimum) frozen in an amber screw-capped plastic vial. PROTECT FROM LIGHT.

Alternate Specimen
Plasma: EDTA, heparin, fluoride

Rejection Criteria
SST tubes, specimens not protected from light.

Methodology
Quantitative Immunoassay

Stability
Room Temperature: 4 hours; Refrigerated 24 hours; Frozen 6 months

Reference Range
By report

Performed
Sunday-Saturday

Turnaround Time1 day
Test CodeMTXS
CPT-4 Code (s)
80299
LOINC Codes
14836-1

Warde
Medical
Laboratory