What is this test?
This is a screening test that helps check a person’s ability to properly form blood clots
 
Sample required
Blood.
 
Patient preparation
No specific patient preparation protocol is required. Inform your doctor if you are on any medications or have any underlying medical conditions or allergies before undergoing this test.
 
Turn-around time (How long does it take?)
5 Hours.
 
Basis of the Test
The partial thromboplastin time (PTT; also known as activated partial thromboplastin time (aPTT)) is a screening test that helps evaluate a person’s ability to appropriately form blood clots. It measures the number of seconds it takes for a clot to form in a sample of blood after substances (reagents) are added. A prolonged PTT means that the blood is taking too long to form a clot, this may be caused by conditions such as liver disease, vitamin K deficiency, or a coagulation factor deficiency (e.g., factor VII deficiency).