ptt (partial thromboplastin time)
HematologyBlood sampleResults 24 hrsNo fasting
PTT (Partial Thromboplastin Time)
Measures clotting time through another part of the clotting pathway. Often paired with PT to assess bleeding concerns.
Sample
Blood
Results
24 hrs
Fasting
Not required
Follow-up
Optional add-on
What this test detects
Partial thromboplastin time
Clot-based coagulometry
Seconds
When to get this test
Clotting assessment
Evaluates a different part of the clotting system than PT, giving a fuller picture together.
Bleeding work-up
Helps investigate unexplained bleeding or bruising.
Heparin monitoring
Can be used to help monitor certain blood-thinning treatments.
How to prepare
01
No special preparation needed.
Common questions
How is PTT different from PT?
PT and PTT check different parts of the clotting process, so they are often ordered together.
Do I need to fast for PTT?
No fasting is needed. You can eat and drink normally before the test.