PTT stands for Partial Thromboplastin Time.
What does PTT mean?
a blood test that measures how long blood takes to clot
PTT stands for partial thromboplastin time, a blood test that measures the time it takes for a clot to form, assessing the intrinsic and common pathways of the clotting cascade. It is most often used to monitor heparin therapy. The activated version, aPTT, adds an activator for a narrower, more reproducible range. A prolonged PTT can indicate clotting factor deficiencies, heparin effect, or the presence of certain inhibitors.
When is PTT used?
PTT is ordered in hematology and on medical and surgical wards, often alongside PT and INR when assessing bleeding risk or anticoagulation.
Frequently asked questions
What does PTT stand for?
PTT stands for partial thromboplastin time, a test of how long blood takes to clot.
What is PTT used to monitor?
PTT is most commonly used to monitor patients receiving heparin.
What is the difference between PTT and aPTT?
aPTT is the activated version, which adds an activator to give a narrower, more reproducible range.
How does PTT differ from INR?
PTT mainly reflects the intrinsic pathway and monitors heparin, while INR standardizes PT and monitors warfarin.