Activated Partial Thromboplastin Time (APTT)

APTT is an abbreviation for activated partial thromboplastin time. Generally, when there is damage to the blood vessels or a nick or cut to the skin, clotting factors are activated. Blood clots then form to become a barrier to the outpouring of the blood, and thus stop the bleeding.

APTT is the time that it takes for the blood to clot, and its test helps in gauging the effectiveness and performance of the clotting factors.

What is an APTT Test?

APTT test helps in measuring how long the blood takes to clot. In the test, a decalcified sample of blood is taken. It then undergoes different processes to ascertain the time it took for the formation of the blood clots. The test aids in assessing how well the clotting pathway and systems associated with the process are working.

The purpose of APTT is to check for the bleeding disorders. It also helps in checking the effectiveness of drugs like heparin, which are used in case of clotting problems.

What is the APTT Test used for?

aPPT is used when accosted with bleeding or clotting problems that have unknown causes. Doctors then start their diagnostic process using APTT test, alongside running some similar tests to check for issues with clotting factor.

APTT tests are also conducted in case of miscarriage. They are also used as a part of screening process before surgery. It is also conducted to check for the effectiveness of heparin anticoagulant therapy.

When should I get an APTT Test?

APTT test is suggested by the doctor when the patient presents complaints of:

• Bruising that is unexplained
• Bleeding
• Blood clots

Furthermore, it may also be requested for in patients suffering from certain diseases like DIC, disseminated intravascular coagulation, liver disease, etc.

How is an APTT Test performed?

The test is fairly simple to perform; a needle is used to draw out blood from the vein. Vessels from the arm or the hand are generally used for drawing out the sample.

APTT Test Normal Range

The range for the test results is contingent on the lab. Moreover, the results may vary as per your medical history, age, health, etc. Hence, it is best that you take your lab findings to your doctor.

Your doctor might also prescribe other tests alongside for more conclusive findings.

What are the risks of an APTT Test?

There are some risks involved with the use of the needle. It can lead to infection, bleeding, bruising. People who have a phobia of needles might also feel lightheaded. There is also pain from the pricking of the needle.

How long does it take to get the APTT Test results?

aPPT test results are attained relatively early; some labs can deliver within few hours; others might take a day.