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Thrombotic Risk Panel

Thrombophilia is an inherited or acquired susceptibility to thrombosis due to an abnormality of blood coagulation. Factor V Leiden thrombophilia is the most common form of inherited thrombophilia, followed by Factor II (prothrombin)-related thrombophilia. In addition, hyperhomocysteinemia, which can be caused by mutations in MTHFR, may compound the risk for thrombosis, when observed along with factor V Leiden or factor II-related thrombophilia. Risks associated with thrombophilia can include deep-vein thrombosis, pulmonary embolism, and cerebral-vein thrombosis.

The Genetics Center Thrombotic Risk Panel includes: targeted mutation analysis for the factor V Leiden mutation (c.1691G>A or p.R506Q), factor II (prothrombin) mutation (p.G20210A), and the MTHFR variants (C677T and A1298C). Molecular testing of each gene individually is also available at the Genetics Center Molecular Diagnostic Laboratory.

Reasons for Referral

  • An individual with unprovoked venous thromboembolism (VTE) before the age of 50.
  • An individual with recurrent VTE.
  • An individual with VTE at an unusual site (cerebral, mesenteric, portal, or hepatic veins).
  • A woman with VTE during pregnancy.
  • A woman with VTE associated with the use of oral contraceptives or hormone replacement therapy.
  • An individual with VTE at any age in an individual with a first-degree relative with VTE before age 50.

Testing Methods

PCR and RFLP analysis for the specific above mentioned mutations.

Turn Around Time

6 days or fewer

Specimen Requirements and Shipping/Handling

Blood: A single tube with 1-5 mL whole blood in EDTA (lavender top).

Saliva: To request a DNA Mouthwash Collection Kit please contact Genetics Center at (714)288-3500.


Store blood at 4°C until shipment. Ship at ambient temperature in an insulated container via overnight delivery within 96 hours of collection.

Send Specimen(s) to:

Genetics Center
211. S Main Street
Suite AA
Orange, CA 92868
Tel: (714)288-3500


Test Limitations

This panel is designed to be a targeted mutation analysis for the mutations listed above. Test results on DNA extracted from a patient with recent liver transplantation or hematopoietic stem cell transplantation must be interpreted with caution. Molecular genetic identity testing of donor tissue may be required in these scenarios.

CPT Codes

Stacked CPT’s: 81240×1, 81214×1, 81291×2, G0452

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