APTT (Activated Partial Thromboplastin Time)
APTT evaluates the intrinsic clotting pathway. Prolonged in hemophilia, heparin therapy, and factor deficiencies.
Test Information
Reports In
Same day (6 hours)
Parameters
1
Requisites
Blood Sample
Sample Type
Blood
Measures
Intrinsic clotting pathway
Identifies
Hemophilia, heparin effect, clotting factor deficiencies
What is the APTT Test?
Activated Partial Thromboplastin Time (APTT) measures the intrinsic coagulation pathway — a different clotting cascade from PT. Together, PT and APTT cover all major clotting pathways. APTT is used to monitor heparin therapy, diagnose hemophilia, and evaluate unexplained bleeding.
Why Should You Take This Test?
Screens intrinsic pathway. Used with PT for comprehensive coagulation assessment.
Who Should Get Tested?
On Heparin Therapy
APTT monitors heparin dosage.
Suspected Hemophilia
APTT is prolonged in hemophilia A and B.
Pre-Surgery
Coagulation screening.
Warning Signs — When Should You Get This Test?
Common Conditions Detected
Frequently Booked Together
Tests commonly ordered alongside APTT for a complete picture
PT/INR
Tests extrinsic pathway
Mixing Studies
If APTT is prolonged, identifies cause
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