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Factor V Leiden (rs6025 or F5 p.R506Q [1]) is a variant (mutated form) of human factor V (one of several substances that helps blood clot), which causes an increase in blood clotting (hypercoagulability).
APC resistance is the inability of protein C to cleave Factor Va and/or Factor VIIIa, which allows for longer duration of thrombin generation and may lead to a hypercoagulable state. This may be hereditary or acquired. [4] The best known and most common hereditary form is Factor V Leiden, which is responsible for more than 95% of cases. [5]
[2] [5] [4] [13] [14] However, the aPTT-based APC resistance test is much less sensitive to the procoagulatory effects of estrogens than is the ETP-based test. [13] [14] [5] [4] [2] [15] Pregnancy [7] and ethinylestradiol (EE)-containing combined birth control pills increase APC resistance as measured by either the aPTT- or ETP-based test.
Factor V Leiden is an inherited blood clotting disorder. It can cause life-threatening clots in the body and complications during pregnancy.
14067 Ensembl ENSG00000198734 ENSMUSG00000026579 UniProt P12259 O88783 RefSeq (mRNA) NM_000130 NM_007976 RefSeq (protein) NP_000121 NP_032002 Location (UCSC) Chr 1: 169.51 – 169.59 Mb Chr 1: 163.98 – 164.05 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Coagulation factor V (Factor V), also less commonly known as proaccelerin or labile factor, is a protein involved in ...
A mutation of coagulation factor V (schematic representation drawn here) is much more common in people with thrombosis than in those without, but is only regarded as a weak risk factor. Tests for thrombophilia include complete blood count (with examination of the blood film), prothrombin time, partial thromboplastin time, thrombodynamics test ...
Occasionally, blood-thinning medication may be indicated to reduce the risk of clotting. [11] A 2005 article concluded that heterozygous carriers who take combined birth control pills are at a 15-fold increased risk of venous thromboembolism, [12] while carriers also heterozygous with factor V Leiden have an approximate 20-fold higher risk. [2]
As such, family history of VTE is a risk factor for a first VTE. [88] Factor V Leiden, which makes factor V resistant to inactivation by activated protein C, [88] mildly increases VTE risk by about three times. [14] [88] Deficiencies of three proteins that normally prevent blood from clotting—protein C, protein S, and antithrombin ...