Activated Partial Thromboplastin Time (aPTT)

Activated Partial Thromboplastin Time (aPTT) is a blood test that measures how long it takes for blood to form a clot. It evaluates the effectiveness of certain proteins and factors in your blood that are essential for stopping bleeding and forming a stable clot. This test helps doctors assess blood clotting function, diagnose bleeding disorders, and monitor medications like heparin that thin the blood. Generally, a longer than normal aPTT indicates potential bleeding problems or clotting deficiencies, while a shorter time may suggest increased clotting risk.