Mammalian protein found in humans
This article is about the coagulation protein. For the software company, see
Factor 5. For Factor V (NAD+), see
chocolate agar.
Coagulation factor V (Factor V), also less commonly known as proaccelerin or labile factor, is a protein involved in coagulation, encoded, in humans, by F5 gene.[5] In contrast to most other coagulation factors, it is not enzymatically active but functions as a cofactor.[5] Factor V deficiency leads to predisposition for hemorrhage, while some mutations (most notably factor V Leiden) predispose for thrombosis.