Not all individuals who are heterozygous for factor V Leiden will experience a thrombotic event. The presence of the R2 polymorphism in the factor V gene increases the likelihood of thrombosis in factor V Leiden heterozygotes. The R2 polymorphism is very common, occurring in 1 in 10 individuals. This polymorphism is part of the HR2 haplotype, a collection of polymorphisms always inherited together.

• For all DNA Test Kits, Free genetic counseling for physicians, patients, and families provided by Kimball Genetics

Not available.

Not all individuals who are heterozygous for factor V Leiden will experience a thrombotic event. The presence of the R2 polymorphism in the factor V gene increases the likelihood of thrombosis in factor V Leiden heterozygotes. The R2 polymorphism is very common, occurring in 1 in 10 individuals. This polymorphism is part of the HR2 haplotype, a collection of polymorphisms always inherited together.

• For all DNA Test Kits, Free genetic counseling for physicians, patients, and families provided by Kimball Genetics