Test Details
Mnemonic
MEX
Ordering Code
3505000
CPT-4 Code(s)
80299
Specimen Information
Collect
Red top
Specimen Preparation
Centrifuge, separate serum from cells within 2 hours and send 1.0 mL serum in a screw capped plastic vial.
Alternate Specimen
Plasma: EDTA
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated
Rejection Criteria
Serum or plasma separator tubes, whole blood, citrated plasma or ACD plasma
Stability
Room temperature: 2 days
Refrigerated: 5 days
Frozen: 2 months
Refrigerated: 5 days
Frozen: 2 months
Methodology
Quantitative Liquid Chromatography/Tandem Mass Spectrometry
Reference Range
Therapeutic: 0.5-2.0 µg/mL
Toxic level: >2.0 µg/mL
Toxic level: >2.0 µg/mL
Performing Laboratory
ARUP Laboratory
New York DOH Approval Status
Yes