Test Details
Mnemonic
TROPT
Ordering Code
3724340
CPT-4 Code(s)
84484
Specimen Information
Patient Preparation
Dietary supplements containing biotin may interfere in assays and may skew results to either falsely high or falsely low. For patients receiving the recommended daily doses of biotin, draw samples at least 8 hours following the last biotin supplementation. For patients on mega-doses of biotin supplements, draw samples at least 72 hours following the last biotin supplementation.
Collect
Serum separator tube (SST)
Specimen Preparation
Centrifuge, separate serum from cells as soon as possible. Send 1.0 mL serum in a screw capped
plastic vial. Minimize exposure to room temperature. Avoid repeated freeze/thaw cycles.
plastic vial. Minimize exposure to room temperature. Avoid repeated freeze/thaw cycles.
Alternate Specimen
Serum: Red top
Plasma: Green sodium heparin
Plasma: Green sodium heparin
Minimum Volume
0.5 mL
Transport Temperature
Frozen
Stability
Room temperature: Unacceptable
Refrigerated: 24 hours
Frozen: 1 year
Refrigerated: 24 hours
Frozen: 1 year
Methodology
Immunoassay
Reference Range
<0.01 ng/mL
Performing Laboratory
Quest SJC
New York DOH Approval Status
Yes