Health Encyclopedia

Platelet Antibody

Does this test have other names?

Antiplatelet antibody test

What is this test?


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 and make up a small portion of your blood volume, but they have an important health function.  


If antibodies have destroyed a considerable amount of your platelets, your doctor may diagnose thrombocytopenia, which means you have an abnormally low platelet count. Sometimes taking blood thinning medications can lead to a condition called drug-induced thrombocytopenia.  

Why do I need this test?

You may have this test if you have a low platelet count or have symptoms that may mean that your production of platelets has been disrupted in some way. Symptoms of a low platelet count include:

  • Skin that bruises easily

  • Wound that bleeds longer than normal

  • Frequent nosebleeds

  • For women, heavy menstrual bleeding

What other tests might I have along with this test?

Your doctor may also order other blood tests, such as a platelet count.

What do my test results mean?



How is this test done?


Does this test pose any risks?


What might affect my test results?

Taking anticoagulant drugs, or blood thinners, for another condition may affect your results.

How do I get ready for this test?



Medical Reviewers:

  • Marcellin, Lindsey, MD, MPH
  • Ziegler, Olivia Walton, MS, PA-C