Methotrexate

Centralized Core Laboratory:Chemistry

Test ID/Workstation: MTX ACHM3

Specimen Type: Blood

Tube Type: Green top (lithium) plasma

Collection Volume: 3.0 mL (minimum 0.2 mL)

Storage: Refrigerated

Availability: Daily, 24 hours

Methodology: Fluorescence Polarization Immunoassay

Special Instructions: Specimen must be protected from light



Specimen must be frozen if not analyzed within 24 hours.



OC Power Word: LMETHOTREX

Lab/Phone: 330-543-8418

TAT: 4 hours

Additional Info: Reference range:

Following a 4-6 hour infusion a patient with a 24 hr serum concentration of >5-10 umol/L, a 48 hr level of > 0.5-1.0 umol/L or a 72 hr level >0.2 umol/L is at increased risk for toxicity if conventional low dose leucovorin rescue is given.



CPT Code: 80299

Synonyms: Mexate

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