| FAC | a protein in blood plasma that is the inactive precursor of thrombin |
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| FAC | an enzyme liberated from blood platelets that converts prothrombin into thrombin as blood starts to clot |
| FAC | resolve into factors |
| FAC | ion of calcium |
| FAC | coagulation factor whose absence is associated with hemophilia B |
| FAC | the constant value of the ratio of two proportional quantities x and y |
| FAC | the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use |
| FAC | resolve into factors |
| FAC | a coagulation factor |
| FAC | a coagulation factor formed in the kidney under the influence of vitamin K |
| FAC | a coagulation factor (trade name Hemofil) whose absence is associated with hemophilia A |
| FAC | coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors |