Activated Partial Thromboplastin Time (aPTT) details
Description
Activated partial thromboplastin time (aPTT) measures how many seconds it takes your blood to clot through what's called the intrinsic and common clotting pathways — essentially testing whether several clotting factors are present and working normally. It's one of the two core coagulation screening tests (along with PT/INR) used to investigate unexplained bruising or bleeding, evaluate clotting factor deficiencies like hemophilia, and check for certain antibodies (like lupus anticoagulant) that interfere with clotting. A prolonged aPTT can mean a clotting factor deficiency, an anticoagulant medication effect, or an inhibitor antibody, while a shortened aPTT is less common and less clinically significant on its own. It's also the standard test used to monitor and adjust dosing for patients on IV heparin therapy.
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Blood tests with Activated Partial Thromboplastin Time (aPTT)
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Single marker
PTT, Activated
$7.49
This test measures activated partial thromboplastin time (aPTT). It is used to screen for deficiencies of plasma coagulation factors and to monitor patients on heparin therapy.
- Activated Partial Thromboplastin Time (aPTT) Measures how long it takes your blood to clot through one of its main pathways. Used to check for bleeding disorders and monitor blood-thinning medications like heparin.