1. Prolonged: can be seen in hemophilia A, hemophilia B, liver disease, intestinal sterilization syndrome, oral anticoagulants, diffuse intravascular coagulation, mild hemophilia; FXI, FXII deficiency; blood Anticoagulant substances (coagulation factor inhibitors, lupus anticoagulants, warfarin or heparin) increased; large amounts of stored blood were transfused.
2. Shorten: It can be seen in hypercoagulable state, thromboembolic diseases, etc.
Reference range of normal value
The normal reference value of activated partial thromboplastin time (APTT): 27-45 seconds.