Canadian Practical Nurse Registration Examination (CPNRE) 2026 – 400 Free Practice Questions to Pass the Exam

Prothrombin Time, or PT, is a crucial laboratory test that measures the time it takes for blood to clot. This test specifically assesses the extrinsic and common coagulation pathways by measuring how long it takes for a fibrin clot to form after adding a tissue factor (thromboplastin) to a sample of the patient's blood.

Elevated PT results can indicate a variety of conditions related to problems in the clotting process, such as vitamin K deficiency, liver disease, or the effects of anticoagulant medications like warfarin. On the other hand, a normal PT indicates that the extrinsic and common pathways of the coagulation cascade are functioning properly.

Understanding PT and its clinical significance helps healthcare professionals monitor patients at risk of bleeding or clotting disorders, making it an essential component of coagulation studies in patient care.