Proceeds from website advertising help sustain Lab Tests Online. AACC is a not-for-profit organization and does not endorse non-AACC products and services.

Coagulation Factors

Print this article
Share this page:
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]

Board approvedAll content on Lab Tests Online has been reviewed and approved by our Editorial Review Board.

At a Glance

Why Get Tested?

To determine whether levels of one or more of your coagulation factors are increased, normal, or decreased

When to Get Tested?

When you have unexplained or prolonged bleeding, abnormal results on coagulation screening tests such as prothrombin time (PT) or partial thromboplastin time (PTT), or have a relative with a hereditary coagulation factor deficiency; you may be tested when your healthcare practitioner wants to monitor the severity of a factor deficiency and/or the effectiveness of treatment.

Sample Required?

A blood sample drawn from a vein in your arm

Test Preparation Needed?