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Test Code MTREX Methotrexate

Important Note

For STAT testing, order a MISCLB to be sent to University of Iowa Diagnostics Laboratory

Routine Testing Performed at Pathology Laboratory in Des Moines, IA

Additional Codes

 

 Test ID

MTREX

EPIC Test ID

LAB481

Specimen Requirements

Preferred Collection Container: 

Green (Lithium Heparin)
No Gel

Also Acceptable Collection Container: 

Red (No Additive)

Collection Information: 

Do not use gel separator tubes.

Transport Information: 

2.0 mL blood/0.6 mL plasma or serum

Minimum Sample Volume

0.4 mL blood/0.2 mL plasma or serum

Specimen Stability

Refrigerated Stability: 

3 days

Frozen Stability: 

6 months

Ambient Stability: 

12 hours

Report Availibility

Performed: 

Daily
24 hours a day

Analytical Time: 

2 hours

Special Notes

Specimens from patients who have received carboxypeptidase can contain a hydrolysis fragment of MTX (DAMPA) that cross-reacts with the methotrexate antibody used in this immunoassay.