Preoperative Evaluation: Prior to gynecological surgeries, aPTT may be tested to assess bleeding risk. Heavy Menstrual Bleeding: For patients presenting with menorrhagia, aPTT helps in diagnosing underlying coagulation disorders like von Willebrand Disease. Unexplained Bleeding: To investigate the cause of unexplained bleeding episodes, which might be due to coagulation factor deficiencies. Pregnancy Complications: To monitor and manage conditions such as pre-eclampsia or HELLP syndrome, where coagulation status can be critically affected.