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



Sahyadri Speciality Labs is committed to provide the highest quality of Medical Laboratory services. There is a continual effort to ensure that the staff of the lab understands the Quality Policy & all the quality documentation, as well as follows the Quality manual and implements the Quality System Procedures all the time. By employing QMS, the lab strives to achieve the highest standard of service to provide the most reliable results, nearest to the true value and at most competitive rates. The lab is committed to good & ethical professional practices giving highest priority to client’s confidentiality and ensuring the reporting of the test values without any bias or influence. The lab implements the QMS so as to conform to ISO 15189:2007 and NABL 112 with the objective of Reducing reporting errors to the minimum, Minimizing customer complaints, Achieving maximum growth of the lab.
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