how pt/inr st works
The INR can be used to adjust a person's drug dosage to get the PT into the desired range that is right for the person and his or her condition. The PT test may be used along with a PTT as the starting points for investigating excessive bleeding or clotting disorders.
PT and APTT: The PT, INR, and Activated Partial. Thromboplastin Time (APTT) tests are common coagula-. tion laboratory tests used to assess the clotting ability of. blood. The PT/INR test evaluates the extrinsic and com-. mon pathways of the coagulation cascade, while the APTT.