The therapeutic PTT range for heparin therapy, given a normal range of 25-35 seconds, is which of the following?

The therapeutic PTT range for heparin therapy, given a normal range of 25-35 seconds, is which of the following?

• A. 25-35 seconds
• B. 38-70 seconds
• C. 60-90 seconds
• D. 15-25 seconds

Answer: (B)

The goal of monitoring with PTT during heparin therapy is to achieve a level about 1.5 to 2 times the patient’s baseline PTT. With a normal PTT of 25-35 seconds, that puts the therapeutic range roughly at 37.5 to 70 seconds, i.e., about 38-70 seconds. This balance ensures adequate anticoagulation to prevent clotting while avoiding excessive bleeding. The other ranges either stay within normal limits or are outside the typical therapeutic window for heparin monitoring.

The goal of monitoring with PTT during heparin therapy is to achieve a level about 1.5 to 2 times the patient’s baseline PTT. With a normal PTT of 25-35 seconds, that puts the therapeutic range roughly at 37.5 to 70 seconds, i.e., about 38-70 seconds. This balance ensures adequate anticoagulation to prevent clotting while avoiding excessive bleeding. The other ranges either stay within normal limits or are outside the typical therapeutic window for heparin monitoring.