Test Details
Mnemonic
PT18Q
Ordering Code
3401179
CPT-4 Code(s)
84393
Specimen Information
Patient Preparation
Dietary supplements containing biotin may interfere in assays and may skew results to be 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
Lavender EDTA
Specimen Preparation
Centrifuge, separate plasma from cells and send 1.0 mL plasma in a screw capped plastic vial.
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated
Rejection Criteria
Hemolysis
Stability
Room temperature: 14 days
Refrigerated: 22 days
Frozen: 22 days
Refrigerated: 22 days
Frozen: 22 days
Methodology
Electrochemiluminescence (ECLIA)
Reference Range
≤0.72 pg/mL
Performing Laboratory
Quest
New York DOH Approval Status
Yes