Coagulation Factors

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Also known as: Factor assays; blood clotting factors; clotting factors; or by the individual factor number (Factor I, Factor II, etc.) or name (Fibrinogen, Prothrombin, etc.)
Formal name: see table

At a Glance

Why Get Tested?

To determine whether one or more of your coagulation factors are decreased, absent or increased.

When to Get Tested?

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

Sample Required?

A blood sample taken from a vein in your arm

Test Preparation Needed?