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Abnormally small amounts of prothrombin in the circulating blood.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
hypoprothrombinaemiaA deficiency of the protein PROTHROMBIN or prothrombin activity in the blood. Prothrombin is necessary for normal blood clotting.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005