An APTT and PT are requested on a patient scheduled for emer…

An APTT and PT are requested on a patient scheduled for emergency surgery. On an optical density clot detection system, normal and abnormal controls for both tests are within range, but the patient’s results are extremely prolonged. The patient’s tests have been performed in duplicate, but there is sufficient plasma, which is dark amber, to repeat the tests. What is the best course of action to follow?