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.

Alternate Specimen

Serum: Red top
Plasma: Green sodium heparin

Minimum Volume

0.5 mL

Transport Temperature

Frozen

Stability

Room temperature: Unacceptable
Refrigerated: 24 hours
Frozen: 1 year

Methodology

Immunoassay
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Reference Range

<0.01 ng/mL
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Performing Laboratory

Quest Valencia
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