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Test Code METX Methotrexate

Important Note

Specimens from patients who have received glucarpidase (carboxpeptidase G2) as a high dose methotrexate rescue therapy should not be tested using this assay.

 

Useful For

Used in monitoring levels of methotrexate to help ensure appropriate therapy.

Reference Values

Normal level:  >10.0 µmol/L 24 hours after dose

Elimination:  >1.0 µmol/L 48 hours after dose

                     <0.2 µmol/L 72 hours after dose

  

CPT Coding

80299

Day(s) Test Set Up

Monday through Sunday

Specimen

Specimen required:  Serum or Plasma

Minimum volume:  2 mL

Specimen stability:  7 days at 2-8°C

Performing Laboratory

MaineGeneral Medical Center