
Factor V Leiden Mutant Detection (G1691A Mutation)









The Factor V Leiden Mutant Detection (G1691A Mutation) test is a blood test that identifies the presence of a specific genetic mutation called factor V Leiden. This mutation can increase the risk of abnormal blood clot formation, helping doctors evaluate the likelihood of venous thrombosis and related conditions.













Understanding Factor V Leiden Mutant Detection (G1691A Mutation)
Factor V is a protein that plays a central role in blood clotting. Normally, activated protein C regulates clot formation by inactivating factor V to prevent excessive clotting. However, a mutation in the factor V Leiden gene (G1691A) makes the factor V protein resistant to being inactivated, which can lead to a higher risk of developing abnormal blood clots, such as deep vein thrombosis (DVT) or venous thromboembolism (VTE).
Identifying the presence of the Factor V Leiden mutation is important because it helps explain why some individuals are more prone to abnormal clotting.
The Factor V Leiden Mutant Detection (G1691A Mutation) test is especially useful for individuals with unexplained or recurrent episodes of blood clots, including deep vein thrombosis (DVT) or venous thromboembolism (VTE). It is recommended for patients with a personal or family history of the factor V Leiden mutation or those with a family background of blood-clotting disorders. Women experiencing recurrent miscarriages or pregnancy complications linked to abnormal clotting may also benefit from this test, as the mutation can contribute to pregnancy loss. In addition, it is valuable in cases of clinically suspected thrombophilia, where an inherited gene mutation may increase the risk of abnormal clot formation. By identifying whether a person carries the factor V Leiden mutation, doctors can assess the risk of thrombosis and guide appropriate preventive measures and treatment strategies.
No special preparation is needed for getting the Factor V Leiden Mutant Detection (G1691A Mutation) test done. However, it is preferred that you share your clinical history, current medications, and supplement use with your doctor before giving the sample, as these may influence the results.
Test result ranges are approximate and may differ slightly between labs depending on the methodology and laboratory guidelines. Do not self-medicate, and always consult a doctor to understand the test results correctly.
Please note: This is an outsourced test. The sample for this test is collected by TATA 1MG and processed at a NABL accredited partnered lab.
What does Factor V Leiden Mutant Detection (G1691A Mutation) measure?
The Factor V Leiden Mutant Detection (G1691A Mutation) test determines whether a person carries the specific genetic change in the factor V gene known as the G1691A mutation. This mutation alters the way factor V functions by making it resistant to inactivation by activated protein C (APC), a natural regulator that normally helps control clot formation. When factor V cannot be properly switched off, the balance between clot formation and breakdown is disrupted, leading to an increased tendency for abnormal blood clots to develop in the veins.
By detecting the presence or absence of this mutation, the test helps doctors determine an individual’s inherited risk of venous thrombosis, including deep vein thrombosis (DVT) and venous thromboembolism (VTE). It also provides useful information for patients with a family history of clotting disorders or those with unexplained episodes of thrombosis. Identifying this genetic risk factor allows healthcare providers to recommend preventive measures, lifestyle modifications, or medical treatment to reduce the likelihood of future clot-related complications.





FAQs related to Factor V Leiden Mutant Detection (G1691A Mutation)
- Oh H, Smith CL. Evolving methods for single nucleotide polymorphism detection: Factor V Leiden mutation detection. J Clin Lab Anal. 2011;25(4):259-88. [Accessed 24 Sep. 2025]. Available From:
- Pastori D, Menichelli D, Valeriani E, et al. Factor V Leiden Thrombophilia. 1999 May 14 [Updated 2024 May 16]. In: Adam MP, Feldman J, Mirzaa GM, et al., editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2025. Available from:
- Albagoush SA, Koya S, Chakraborty RK, et al. Factor V Leiden Mutation. [Updated 2023 Apr 8]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from:
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