Factor II **

The Factor IX test is primarily used to diagnose hemophilia B, assess Factor IX deficiency, monitor treatment effectiveness, and support the diagnosis of blood clotting disorders.

A factor VIII activity assay is a blood test that measures the activity of factor VIII, a protein that helps blood clot. This test can help diagnose hemophilia A and other clotting disorders. 

The Factor XI test is primarily used to diagnose Factor XI deficiency (Hemophilia C), assess bleeding risk, monitor treatment, and support the diagnosis of other blood clotting disorders

This test measures the time it takes for the earlobe to stop bleeding after a vascular (blood vessel) wound is created with a blood lancet. It is performed in preoperative patients receiving anticoagulants or with suspected coagulation disorders.

Factor X is a clotting protein (also called a clotting factor). Clotting factors are specialized proteins that are essential for proper clotting, the process by which blood clumps together to plug the site of a wound to stop bleeding. Clotting requires a series of reactions to ultimately form a clot to plug a wound.
The factor X assay is a blood test to measure the activity of factor X