Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Prothrombin thrombophilia ?
    ### Response:
    Prothrombin thrombophilia is an inherited disorder of blood clotting. Thrombophilia is an increased tendency to form abnormal blood clots in blood vessels. People who have prothrombin thrombophilia are at somewhat higher than average risk for a type of clot called a deep venous thrombosis, which typically occur in the deep veins of the legs.
    