Inpatient and Outpatient Orderable

Methotrexate Level Build info

Synonyms

  • METHOTREXATE LEVEL
  • MTX
  • MEXATE
  • METOJECT
  • NORDIMET
  • OTREXUP
  • RASUVO
  • REDITREX
  • TREXALL
  • XATMEP
  • LAB481

Procedure Name

METHOTREXATE LEVEL

Procedure Master Number

LAB481

Cerner Name

MTRX

Procedure ID

7640

Clinical Info

Specimens from patients who received glucarpidase as a high dose methotrexate rescue therapy should not be tested with this enzyme immunoassay to avoid the reporting of falsely elevated methotrexate values.

Specimen Sources

 Blood, Arterial Blood, Capillary Blood, Central Line Blood, Venous

Specimen Types

 Blood

Container

Red Top Tube

Collection Instructions

Specimens from patients who received glucarpidase as a high dose methotrexate rescue therapy should not be tested with this enzyme immunoassay to avoid the reporting of falsely elevated methotrexate values.

Specimen Volume

1 mL of serum

Transport Instructions

Refrigerate

Specimen Stability

2 weeks Refrigerated

Methodology

Enzyme Immunoassay

Days Performed

Monday through Sunday

Performing Laboratory

Northwell Core Lab at CFAM

CPT

80204

PDM

 5900975

Only Orderable at Locations:

 Orderable Everywhere

Results
Component Name Base Name Common Name External Name
METHOTREXATE LEVEL, SERUM MTX METHOTREXATE LVL Methotrexate

Result Interpretation

Methotrexate serum concentrations depend on indication for use, dosage, mode of administration, treatment regimen, individual pharmacokinetics, metabolism and other clinical factors.

Expected Methotrexate levels after high dose therapy
After 24 hours: approximately 10 mmol/L
After 48 hours: approximately 1 mmol/L
After 72 hours: approximately 0.2 mmol/L

Forms
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