Does this test have other names?
Antiplatelet antibody test
What is this test?
This test looks for platelet antibodies in your blood in order to find out the cause
of a low platelet count.
Platelets are the part of your blood mainly responsible for clotting. They are made
in your bone marrow along with white and red blood cells. Platelets are actually just
fragments of cells. They make up a small part of your blood volume, but they have
an important health function.
If you have platelet antibodies in your blood, it means your immune system is mistakenly
creating antibodies to attack the platelets in your blood. People with idiopathic
thrombocytopenic purpura or systemic lupus erythematosus may have platelet antibodies.
If antibodies have destroyed a considerable amount of your platelets, your healthcare
provider may diagnose thrombocytopenia. This means you have an abnormally low platelet
count. Sometimes taking blood-thinning medicines can lead to a condition called drug-induced
Why do I need this test?
You may have this test if you have a low platelet count. You may also have this test
if you have symptoms that may mean that your production of platelets has been disrupted
in some way. Symptoms of a low platelet count include:
What other tests might I have along with this test?
Your healthcare provider may also order other blood tests. If you have bleeding or
anemia, you may need a platelet count or complete blood cell count (CBC).
What do my test results mean?
Many things may affect your lab test results. These include the method each lab uses
to do the test. Even if your test results are different from the normal value, you
may not have a problem. To learn what the results mean for you, talk with your healthcare
A normal result is negative, meaning you have no platelet antibodies. A positive result
means that platelet antibodies have been found in your blood. It may mean that your
blood may not be able to clot the way it should.
How is this test done?
The test requires a blood sample, which is drawn through a needle from a vein in your
Does this test pose any risks?
Taking a blood sample with a needle carries risks that include bleeding, infection,
bruising, or feeling dizzy. When the needle pricks your arm, you may feel a slight
stinging sensation or pain. Afterward, the site may be slightly sore.
What might affect my test results?
Taking blood-thinning medicine (anticoagulants) for another condition may affect your results.
How do I get ready for this test?
You don't need to prepare for this test. But 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.