A Prothrombin Time (PT) test measures how long it takes for blood to clot. High PT levels mean that blood is taking longer to clot than normal, which could indicate a bleeding disorder, liver disease, or the effects of blood-thinning medications like warfarin. Other potential causes include vitamin K deficiency or conditions affecting the coagulation pathway. Treatment varies based on the underlying cause but may involve medication adjustments, vitamin K supplementation, or specialized therapies to address the specific clotting disorder.