Eating foods that have vitamin K, such as broccoli, chickpeas, kale, turnip greens, and soybean products.
Drinking a lot of alcohol.
Taking some herbal products or natural remedies.
What To Think About
The U.S. Food and Drug Administration (FDA) has approved a home test for prothrombin time (PT). If you need a PT test frequently and for a long time, you may want to ask your doctor if this home test is an option for you.
A PT is done at the same time of day each time so test results can check whether the right dose of warfarin is being used to prevent blood clots.
Another blood clotting test, called partial thromboplastin time (PTT), measures other clotting factors. Partial thromboplastin time and prothrombin time are often done at the same time to check for bleeding problems. To learn more, see the topic Partial Thromboplastin Time.
Prothrombin levels are checked along with other liver tests, such as aspartate aminotransferase and alanine aminotransferase to check how the liver is working.