Residual serum prothrombin of control dogs and affected GSDs.

The PT of citrate plasma was compared with that of serum allowed to clot for 1, 2, or 7 hours. The results are expressed as a serum PT ratio (%) representing plasma PT/serum PT × 100. Control = mean + SD of 15 healthy dogs; GSD = mean + SD of 5 clinically affected GSDs.