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Thrombophilia Screen II, Inherited
Test CodeTSCR2
Alias/See Also
11327
CPT Codes
85300, 85303, 85306, 81240, 81241
Includes
Factor V (Leiden) Mutation Analysis with Reflex to HR2 Mutation Analysis
Prothrombin (Factor II) 20210G→A Mutation Analysis
Antithrombin III Activity
Protein C Activity
Protein C Activity
Protein S Antigen, Free
If Factor V Leiden is Heterozygous for the R506Q mutation, then HR2 testing will be performed at an additional charge (CPT code: 81400).
Prothrombin (Factor II) 20210G→A Mutation Analysis
Antithrombin III Activity
Protein C Activity
Protein C Activity
Protein S Antigen, Free
If Factor V Leiden is Heterozygous for the R506Q mutation, then HR2 testing will be performed at an additional charge (CPT code: 81400).
Preferred Specimen
1 mL frozen platelet-poor plasma (x3) collected in separate 3.2% sodium citrate (light blue-top) tubes, and
5 mL whole blood collected in separate EDTA (lavender-top) tubes
5 mL whole blood collected in separate EDTA (lavender-top) tubes
Minimum Volume
0.5 mL (x3) plasma • 3 mL whole blood
Other Acceptable Specimens
Whole blood collected in: EDTA (royal blue-top) or ACD-B (yellow-top) tube
Instructions
This panel requires platelet-poor plasma and whole blood.
Please submit a separate, frozen vial for each special coagulation assay ordered. Draw blood in a light blue-top tube containing 3.2% sodium citrate, mix gently by inverting 3-4 times. Centrifuge 15 minutes at 1500 g within one hour of collection. Using a plastic pipette, remove plasma, taking care to avoid the WBC/platelet buffy layer and place into a plastic vial. Centrifuge a second time and transfer platelet-poor plasma into a new plastic vial(s). Freeze immediately and transport on dry ice.
Whole Blood: Preferred shipping temperature is frozen, but room temperature shipping is acceptable.
Transport Temperature
Frozen
Specimen Stability
Plasma
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 14 days
Whole blood
Room temperature: 8 days
Refrigerated: 8 days
Frozen: 30 days
Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen: 14 days
Whole blood
Room temperature: 8 days
Refrigerated: 8 days
Frozen: 30 days
Methodology
Polymerase Chain Reaction & Detection • Chromogenic Substrate • Clotting Assay • Immunoturbidimetric
Reflex: Fluorescent Microspheres • Oligonucleotide Ligation Assay • Polymerase Chain Reaction (PCR)
FDA Status
Factor V (Leiden) Mutation Analysis and Prothrombin (Factor II) 20210G→A Mutation Analysis: This test was developed and its analytical performance characteristics have been determined by Quest Diagnostics. It has not been cleared or approved by FDA. This assay has been validated pursuant to the CLIA regulations and is used for clinical purposes.
Setup Schedule
Set up: Daily; Report available: 2 days after receipt at the performing laboratory. Add three (3) days for transport.
Reference Range
See Laboratory Report
Clinical Significance
Factor V Leiden (R506Q) is the most common genetic determinant for hereditary venous thrombosis. Another DNA variant, the HR2 allele, has been associated with a 3-4 fold increased risk to venous thrombosis when it occurs in the presence of the Factor V Leiden mutation.
Performing Laboratory
Quest Diagnostics Nichols Institute-San Juan Capistrano, CA |
33608 Ortega Highway |
San Juan Capistrano, CA 92675-2042 |
Last Updated: June 22, 2023