Prothrombin Time (PT)
LABOKLIN Service ID: 599
This test comprises the coagulation factors of the extrinsic system. It has to be taken into account, however, that levels may be normal in chronic coagulation. Prothrombin time is used as diagnostic aid in suspected poisoning with vitamin K antagonists (coumarin and warfarin derivatives) and for therapy monitoring while vitamin K is administered.
citrate plasma 1:10 (1 part citrate + 9 parts blood) 0.5 ml (cooled).