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Prothrombin 20210A
One of the newest detected causes of hypercoagulability is prothrombin 20210A allele, an abnormality described in 1996.
Frequency of this abnormality varies from 0.7% to 6.0% among whites, with rare appearances among Africans and Asians, suggesting that the defect may have also appeared after the divergent migrations of the populations.
The combination of prothrombin 20210A with other defects such as factor V Leiden, protein S deficiency, protein C deficiency, or antithrombin deficiency has been reported.
The mechanism by which prothrombin 20210A allele is responsible for hypercoagulability is uncertain.
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