Test Details

Mnemonic

MTXS

Ordering Code

3620520

CPT-4 Code(s)

80204

Specimen Information

Collect

Red top

Specimen Preparation

Centrifuge, separate serum from cells within 2 hours of collection and send 3.0 mL serum in an
amber screw capped plastic vial.
Please note, this sample is no longer required to be protected from light.

Alternate Specimen

Plasma: Lavender EDTA, green or sodium lithium heparin

Minimum Volume

1.0 mL

Transport Temperature

Frozen

Rejection Criteria

Serum separator tube (SST)

Stability

Room temperature: 4 hours
Refrigerated: 14 days
Frozen: 6 months

Methodology

Quantitative Immunoassay
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Reference Range

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 le
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Performing Laboratory

ARUP Reference Laboratory
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New York DOH Approval Status

Yes
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