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MTX
METHOTREXATE, SERUM

Test Code MTX 
Test METHOTREXATE, SERUM 
Methodology Fluorescence Polarization Immunoassay (FPIA) 
Specimen Draw blood in a plain, red-top tube. (SERUM GEL TUBE IS NOT ACCEPTABLE.) Spin down and send 2.0 mL (0.15 mL minimum) of serum refrigerated.

Label Serum Aliquots: Serum From Red Top Tube 

Reference Values No therapeutic range has been established.
Toxic concentrations (with citrovorum factor-leucovorin rescue) are:
> 5.0 Ámol/L at 24 hours
> 1.0 Ámol/L at 48 hours
> 0.1 Ámol/L at 72 hours
During high dose regimens methotrexate levels may reach concentrations > 1,000 Ámol/L. 
Analytic Time 1 Day - Available STAT 
Day(s) Test Set Up Monday through Sunday 
CPT Code(s) 80299