Methotrexate, Sensitive
2005405
Ordering Recommendation
 
Mnemonic
METREXSN
Methodology
Quantitative Immunoassay
Performed
Sun-Sat
Reported
Within 24 hours  
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
Specimen Required
Patient Preparation
  
Collect
Plain red. Also acceptable: Green (sodium heparin), lavender (EDTA), pink (K2EDTA), or gray (sodium fluoride/potassium oxalate)  
Specimen Preparation
Protect from light during collection, storage, and shipment. Separate serum from cells within 2 hours of collection. Transfer 3 mL serum to an ARUP Amber Transport Tube. (Min: 1 mL)  
Storage/Transport Temperature
Frozen.  
Unacceptable Conditions
Serum separator tubes. Specimens not protected from light.  
Remarks
  
Stability
After separation from cells: Ambient: 4 hours; Refrigerated: 24 hours; Frozen: 6 months  
Reference Interval
Effective August 15, 2011
 
Therapeutic Range
Low dose 0.50-​1.00 µmol/L
High dose/24 hours 5.00 µmol/L or less
48 hours 0.50 µmol/L or less
72 hours 0.10 µmol/L or less
Interpretive Data
 
Note
 
CPT Code(s)
80299
Components
Component Test Code*Component Chart Name
2005406Methotrexate, Sensitive
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • methotrexate drug level
  • methtrexate concentration
  • MTX