Activated Partial Thromboplastin Time


Overview of Activated Partial Thromboplastin Time

What is Activated Partial Thromboplastin Time?

aPTT is a test done to assess clotting disorders of blood and usually done along with Partial Thromboplastin time (PTT) and INR. The test calculates the time in which your blood clots. It is a test used to evaluate coagulation factors like XII, XI, IX, VIII, X, V , prothrombin and fibrinogen. This test is usually ordered if you have symptoms of unexplained bleeding, inappropriate blood clotting, or recurrent miscarriages; when you are on heparin anticoagulant therapy for monitoring purposes; and also many times routinely as a part of pre surgical screen.

Sample Type

The sample type collected for Activated Partial Thromboplastin Time is: Blood

Preparation for Activated Partial Thromboplastin Time

  • No special preparation required

Why Get Tested for Activated Partial Thromboplastin Time?

  1. If you have symptoms of unexpanied bleeding, inappropriate blood clotting, or recurrent miscarriages
  2. If you are on heparin anti coagolant therapy for monitoring purposes  
  3. If you have/had recurrent miscarriages
  4. As part of routine check up before any surgery
  5. If you have a liver disorder



What Results of Activated Partial Thromboplastin Time mean?


  • Prolonged PTT may be seen in Haemophilia A and B, Von Willibrand's disease, vitamin K deficiency, severe liver disease 


Provided By



For over a hundred years, human pathology has been one of the keystones of medicine and rightly so at SRL, we offer our patients world-class Pathology services because their well-being is of the utmost importance to us. Pathology is quite simply the scientific study of the overall response of your body to any foreign influence, i.e., disease. Actually, we use this knowledge to diagnose & subsequently treat your ailment. What we basically do is carefully compare the normal structure and function of a human body (anatomy and physiology) to the abnormal structure and function we witness in an unwell human. Doing this is the most crucial phase & we take note of even the minutest details while adjudging the extent of your ailment because one slip can lead to an incorrect diagnosis, posing serious threat to your health. Our experts ensure that they are extremely careful while analyzing the samples. This is where our advanced technology chips in. SRL is proud to host state-of-the-art equipments based on the latest technology for a speedy and accurate result. We do not take any chances whatsoever with your health & well-being. Avail our Pathology services with no hesitation. You are always in good hands with SRL.

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