21st November 2019


What is the normal PTT for heparin?

The aPTT is considered a more sensitive version of the PTT and is used to monitor the patient's response to heparin therapy. The reference range of the aPTT is 30-40 seconds. The reference range of the PTT is 60-70 seconds.

Correspondingly, what is the difference between INR and PTT?

The prothrombin time (PT) is used, often along with a partial thromboplastin time (PTT), to help diagnose the cause of unexplained bleeding or inappropriate blood clots. The PT and INR are used to monitor the effectiveness of the anticoagulant warfarin.

Is PTT and INR the same?

study. Individually these tests are commonly referred to as a PT (Prothrombin Time), PTT (Partial Thromboplastin Time), and INR (International Normalized Ratio). During some surgeries it is important that the blood not clot as quickly as normal, and medications may be given to slow the clotting time.

What is the normal range for PTT and INR?

Normal Lab Values
TestAbbreviationNormal Ranges
Coagulation Parameters
Prothrombin timePT11-14 seconds
Partial thromboplastin timePTT25-35 seconds
International normalized ratioINR0.8 to 1.2
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