Methotrexate : 1000652

Test Code
MTX or 1000652

CPT Codes

Serum separator tube (gold top preferred), plain red top tube, or green top plasma separator tube (lithium heparin). Protect from light.

Transport Container
Protect from light. Centrifuge the serum separator tube or plasma separator tube, transfer serum or plasma to an amber transport tube (preferred) or protect the separator tube from light with foil or place in an amber bag, and transport; if a plain red top tube, centrifuge and aliquot serum (Min. 0.5 mL) into an amber transport tube (preferred) or protect the transport tube from light with foil or place in an amber tube.

Transport Temperature

Specimen Stability
After separation from cells and light protected: Ambient: 4 hours; Refrigerated: 24 hours; Frozen: Undetermined

Homogeneous Enzyme Competitive Immunoassay

Setup Schedule
Sunday - Saturday

Report Available
1 day

Reference Range
The concentration of methotrexate in serum or plasma is dependent on the time of the last drug dose; mode of administration; concomitant drug therapy; sample condition; time of sample collection; and individual variations in absorption, distribution, biotransformation, and excretion. These parameters must be considered when interpreting results.

Serum methotrexate concentrations above 5 umol/L 24 hours post high-dose therapy may indicate a risk of toxicity.

Performing Laboratory
med fusion

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.