Answer:
The doctor can mix a blood sample from the hemophiliac patient with David's blood.
Step-by-step explanation:
This test is called Mixture Test and is performed quickly when there is no time to do more detailed and accurate tests. In the mixture text, two blood samples are mixed, where one is from a patient with hemophilia. when mixing the two samples, the doctor observes whether there were coagulation inhibitors in the patient's blood, and can then draw conclusions about the presence of hemophilia in the patient.