Test Details & Preparation
When you bleed, a cascade of reactions takes place in your body to stop or prevent blood loss so that the damaged tissue can be repaired. This process is called coagulation. Coagulation factors, or clotting factors, are the substances in your blood that help a clot form. There are 13 factors that control clotting. A deficiency in any one of them will compromise the clotting process and can lead to excessive bleeding. Factor X is one of these coagulation factors.
Your doctor may recommend a factor X assay test to determine if your body makes enough of this particular coagulation factor. Without it, your body will be unable to form blood clots normally.
Women with factor X deficiency may suffer from heavy menstrual periods and bleeding after childbirth. Newborn boys with inherited factor X deficiency may suffer from prolonged bleeding after circumcision.
Emergency dental work or surgery may cause severe bleeding and alert you to a potential problem. It is important to see your doctor for a diagnosis if you have any blood clotting problems.
No special preparation is necessary for a factor X assay test. However, tell your doctor if you are taking any blood-thinning medications such as Warfarin. Your doctor may advise you to stop taking blood thinners before the test. Your doctor will need to take a sample of blood from your arm to perform the test.
A normal result for a factor X assay should be between 60 and 140 percent of the laboratory reference value. Your doctor will explain the specifics of your results.
If your results are abnormal, you have a low level of factor X. This could be caused by an inherited factor X deficiency amyloidosis disseminated intravascular coagulation a vitamin K deficiency fat malabsorption and the use of heparin or Warfarin blood thinners.