Why get tested?
To determine whether one or more of your coagulation factors is missing, deficient, or dysfunctional

When to get tested?
When you have unexplained or prolonged bleeding, an abnormal Prothrombin Time (PT) or Partial Thromboplastin Time (PTT) test, or have a relative with a hereditary coagulation factor deficiency; sometimes when your doctor wants to monitor the severity of a factor deficiency and the effectiveness of treatment

Sample required?
A blood sample drawn from a vein in your arm, or sometimes, via fingerstick