What is the APTT result for a patient with Hemophilia?

In hemophilia, the activated partial thromboplastin time (APTT) is typically prolonged or high. This is because hemophilia is a bleeding disorder primarily affecting the intrinsic pathway of the coagulation cascade, which involves factors VIII and IX (hemophilia A and B, respectively). When the APTT is measured, it assesses the time it takes for blood to clot through this intrinsic pathway. In patients with hemophilia, the deficiency or dysfunction of these factors leads to a longer time required for clot formation, resulting in a high APTT result.

The normal APTT response would indicate a functioning intrinsic pathway, which is not the case in hemophilia. Additionally, a low APTT result would suggest a hypercoagulable state or possible technical error, while a variable APTT might suggest a mixed or atypical coagulation profile, which is not characteristic of hemophilia itself. Therefore, the correct understanding of the APTT result in patients with hemophilia aligns with the finding of a prolonged or high APTT.