Activated Partial Thromboplastin Time

Test Results & Interpretations

Overview of Activated Partial Thromboplastin Time

Test Description

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.

Why Get Tested

  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




  • No special preparation required

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




Max Lab runs 11 NABL accredited, 24×7 operational laboratories in Delhi NCR, Punjab and Uttaranchal. Our labs are equipped with fully automated state-of-art technology and infrastructure to achieve the highest level of excellence and quality results. With over 500 highly trained staff and over 70 doctors who are trained in various sub-specialities at the best institutes in India and overseas, Max Lab boasts of having highly qualified haematologists, histopathologists, biochemists and microbiologists. We evaluate over 50, 00,000 samples every year with access to sample quantities not readily available to most institutions. This depth of experience directly benefits us in catering to the patient with complex or rare cases and in interpreting unusual results. At the core of our expertise is the ability to provide our patients with an extensive and ever-growing portfolio of cutting-edge and routine testing for a broad range of disease states. Our capability enables us to quickly and easily move from a sound diagnostic course of action to confident decision making for improved patient care. Max Healthcare, a leading name in the healthcare industry, brings its medical expertise and hospital-quality healthcare in the comfort of your home through Max@Home. With a special purpose to help people lead a life with independence and dignity, we deliver our services with compassion, excellence and reliability. To help you help you recover faster and lead a comfortable life, we provide nursing care attendants, physiotherapists and doctors for home visits. We also arrange for home sample collection and facilitate medical equipment on rent.

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