Prothrombin Time

Prothrombin Time (PT) is a blood test used to determine how long it takes for the body’s blood clotting system to function. It is also used to monitor treatment with medication that prevents the formation of clots.

Prothrombin is one of the clotting factors produced by the liver. There are dozens of clotting factors produced by the human body and prothrombin is one of the most common.

Why Is It Done?

This test is used to determine the causes of abnormal bleeding or bruising. The test may also be used to find Vitamin K deficiencies or deficiencies in other blood clotting factors. It is also used to monitor the effects of Warfarin, which is used to prevent blood clots. Many doctors prescribe this drug to treat diseases such as atrial fibrillation.

You may also be connected to a Holter monitor while the blood work is being done to check on your heart’s electrical activities.

How To Prepare

Many medications can alter the results of the test, so it is important to tell your doctor about any prescription or non-prescription drugs you are taking.

What Are The Risks?

The risks of this procedure are minimal. However, there may be slight bruising around the puncture site and the vein may become inflamed, but this condition is rare and can be treated by applying a warm compress several times a day for a couple of days.

These are just some of the various tests and procedures done in our labs.

More Information

Contact Us


Heart & Vascular Center

Ambulance Services
MMG Cardiovascular & Thoracic Surgery


Heart and Vascular Center
3106 NW Arlington Avenue
Lawton, Oklahoma 73505
MMG Cardiovascular & Thoracic Surgery
3201 West Gore Boulevard, Suite G2
Lawton, Oklahoma 73505