F5 (coagulation factor V) (eg, hereditary hypercoagulability) gene analysis, Leiden variant
CPT4 code
Name of the Procedure:
Coagulation Factor V (F5) Gene Analysis, Leiden Variant
Technical Term: F5 Gene Mutation Test, Leiden Variant Analysis
Summary
This is a genetic test that identifies the presence of a specific mutation in the Factor V gene, known as the Leiden variant. The test is used to assess an individual's risk of developing blood clots, related to hereditary hypercoagulability (a condition making the blood more prone to clotting).
Purpose
The F5 gene analysis for the Leiden variant helps to diagnose a genetic propensity for thrombophilia, a condition where the blood has an increased tendency to form clots. It can inform preventative measures and treatment options to reduce the risk of clotting disorders like deep vein thrombosis (DVT) and pulmonary embolism (PE).
Indications
- Family history of thrombophilia or blood clotting disorders.
- Personal history of recurring blood clots without an apparent cause.
- Women planning pregnancy or on hormonal therapy showing signs of thrombophilia.
- Individuals who experience clots at a young age or in unusual sites.
Preparation
- Generally, no special preparation such as fasting is required for the gene analysis.
- Patients should inform their healthcare provider about any medications they are taking.
Procedure Description
- Sample Collection: Usually a blood sample is drawn from the patient. Occasionally, a buccal (cheek) swab may be used.
- DNA Extraction: The collected sample undergoes DNA extraction in the laboratory.
- Genetic Testing: The DNA is analyzed for the presence of the Leiden mutation in the F5 gene using Polymerase Chain Reaction (PCR) or similar techniques.
- Result Interpretation: A geneticist or a specialized technician interprets the results, which are then reviewed by a healthcare provider.
Duration
The procedure itself (sample collection) takes a few minutes. Laboratory analysis can take several days to a couple of weeks.
Setting
Typically performed in a clinical laboratory, with sample collection done in a hospital, outpatient clinic, or specialized diagnostic center.
Personnel
- Phlebotomists or nurses for sample collection.
- Laboratory technicians and geneticists for DNA analysis.
- Healthcare providers such as doctors or genetic counselors for result interpretation and patient consultation.
Risks and Complications
Risks associated with blood sample collection are minimal but can include minor bruising at the puncture site. Buccal swabs have virtually no risk.
Benefits
Early identification of the Factor V Leiden mutation helps in taking preventive measures against clot formation. It can guide treatment strategies and lifestyle modifications to manage and reduce risks associated with thrombophilia.
Recovery
There is no recovery period for the genetic test itself. Patients can resume normal activities immediately following sample collection.
Alternatives
- Other thrombophilia screenings, such as tests for Prothrombin G20210A mutation or Antithrombin III deficiency.
- Non-genetic blood tests like D-dimer, which can indicate clotting status but do not provide information about genetic predisposition.
Patient Experience
Patients will experience a minor needle prick if giving a blood sample, or no discomfort if providing a buccal swab. There is no pain associated with the genetic analysis as it is conducted in a laboratory setting.