Does this test have other names?
Factor V assay, clotting factor tests
What is this test?
A factor V test is a blood test that checks for a deficiency in a protein known as
factor V. Factor V is a protein that helps your blood to clot. Having too little factor
V causes a rare bleeding disorder. Your body has a number of protein "clotting factors."
They are identified by Roman numerals.
Factor V deficiency is an inherited disorder. It is called an autosomal recessive
gene disorder. This means both parents must have the defective gene and pass it on
to their children for this to happen.
Why do I need this test?
If you have certain symptoms, such as unexplained or extra bleeding or bruising, it
may mean that your blood is not clotting the way it should. You might have a deficiency
in one of the clotting factors. Your healthcare provider may do a blood test to check
for the presence and function of the individual clotting factors to see if you have
a deficiency in any of them.
What other tests might I have along with this test?
Along with tests to check for factor V deficiency, your healthcare provider might
check your blood for deficiencies in other clotting factors. Prothrombin time and
partial thromboplastin times may also be checked.
What do my test results mean?
Test results may vary depending on your age, gender, health history, the method used
for the test, and other things. Your test results may not mean you have a problem.
Ask your healthcare provider what your test results mean for you.
In a test of your clotting factors, the results are usually given as a percentage.
So if you get a result of 100%, it means your factor V is at 100% of its normal value.
Levels between 25% and 60%mean a mild factor V deficiency. This usually causes no
symptoms. Levels of 1% to 10% are severely low and can lead to major bleeding issues.
How is this test done?
The test is done with a blood sample. A needle is used to draw blood from a vein in
your arm or hand.
Does this test pose any risks?
Having a blood test with a needle carries some risks. These include bleeding, infection,
bruising, and feeling lightheaded. When the needle pricks your arm or hand, you may
feel a slight sting or pain. Afterward, the site may be sore.
What might affect my test results?
A deficiency of factor V is quite rare (about 1 in 1 million) and can be a genetic
disorder passed on from parents to their children. But some clotting factors, including
factor V, can decrease because of certain illnesses, such as liver disease, cancers,
autoimmune diseases, and a disease called disseminated intravascular coagulation.
It can also happen after exposure to some toxins.
How do I get ready for this test?
You don't need to prepare for this test. Be sure your healthcare provider knows about
all medicines, herbs, vitamins, and supplements you are taking. This includes medicines
that don't need a prescription and any illicit drugs you may use.