What is Partial Thromboplastin Time (PTT) Test?
Partial Thromboplastin Time (PTT) Test is a blood test that is used to check how well your blood clots. It measures the time it takes for small amounts of substances in your blood to clot. Elevated PTT results may indicate blood clotting disorders, such as hemophilia or lupus antiphospholipid syndrome, or it may be a sign of certain medications or medical conditions.
Preparation for Partial Thromboplastin Time (PTT) Test
Your doctor will provide instructions on how to prepare for a partial thromboplastin time (PTT) test. Generally, most tests require you to fast for 8 to 12 hours prior to having your blood drawn. You should also avoid taking any medications, including aspirin or non-steroidal anti-inflammatory drugs (NSAIDs), at least 24 hours before the test.
Procedure for Partial Thromboplastin Time (PTT) Test
During a partial thromboplastin time (PTT) test, a healthcare professional will draw a sample of your blood from a vein in your arm. The sample will then be sent to a laboratory for further testing.
Types of Partial Thromboplastin Time (PTT) Test
There are two types of partial thromboplastin time (PTT) tests. The first type is the prothrombin time (PT) test. The PT test measures the time it takes for a sample of your blood to clot when it is mixed with tissue factor, calcium, and two other substances. The other type is the activated partial thromboplastin time (APTT) test. The APTT test measures the time it takes for your blood to clot when it is mixed with tissue factor, an enzyme, and calcium.
Risks of Partial Thromboplastin Time (PTT) Test
Generally, a partial thromboplastin time (PTT) test is a safe procedure. There is very little risk associated with having your blood drawn. You may experience some discomfort or bruising at the site where the needle was inserted.
Why Partial Thromboplastin Time (PTT) Test is performed?
A partial thromboplastin time (PTT) test is usually performed to diagnose certain blood clotting disorders or when medications have been taken that can cause bleeding or clotting problems. It may also be used to monitor therapy for clotting problems or to diagnose liver disease.
When to get Partial Thromboplastin Time (PTT) Test?
Your healthcare provider may order a partial thromboplastin time (PTT) test if you have a history of blood clotting disorders or if you have taken certain medications that can cause bleeding or clotting problems. It may also be ordered if you have signs and symptoms of a blood clotting disorder, such as frequent nosebleeds or prolonged bleeding from a cut.