Definition of Thrombinogen Thrombinogen: Better known today as
prothrombin, a coagulation (clotting) factor needed for the
normal clotting of blood. There is a cascade of biochemical
events that leads to the formation of the final clot. In this
cascade, prothrombin is a precursor to thrombin. Because
prothrombin comes before thrombin, it is called prothrombin. The
prothrombin time is a clotting test. a test done to test the
integrity of part of the clotting scheme. Familiarly called the
"pro time," the test is the time needed for clot formation after
a substance called thromboplastin (+ calcium) has been added to
plasma.Source: MedTerms™ Medical Dictionary Last Editorial
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