What is this test?
This laboratory test is performed on a blood sample to evaluate the time required by the blood to clot. It finds out the abnormalities in blood clotting and if the anticoagulant medicines are working fine.
Why is this test performed?
This test is performed:
- To diagnose bleeding or clotting disorders
- To monitor the efficacy of anticoagulant medicines, such as Warfarin
- Before surgical procedures to rule out the risk of uncontrolled bleeding
- To check for liver diseases.
WHY IS PT TEST PERFORMED?
Prothrombin test is performed for the following reasons:
- To check for bleeding disorders
- To check for clotting disorders
- If a person is on blood-thinning medicines, the doctor will ask for a PT or INR test, to rule out the effectiveness of the medicine
- Before any surgical procedure
- What is Prothrombin?
Prothrombin is a protein present in the plasma that works as a clotting factor. Clotting factors work together to stop bleeding by making clots.
- What medicines can affect the test results?
Following medicines can affect the test results:
- Antibiotics
- Barbiturate
- Oral contraceptives
- Vitamin K
- Hormone replacement therapy.
- Can Alcohol affect the test results?
Yes, do not consume alcohol before the test. Inform your doctor if you are a regular alcohol consumer.
- What foods will affect the test results?
Following foods will affect your test results:
- Beef
- Green tea
- Pork liver
- Chickpeas
- Kale
- What are the symptoms of a bleeding disorder?
Following are the symptoms of a bleeding disorder:
- Unexplained bleeding
- Bruising
- Unexplained nose bleeding
- Heavy menstrual bleeding.
Normal ranges:
PT: 8.7-11.5 seconds
INR: 0.8-1.2.
- Interpretation of test results:
High PT: Bleeding disorder
Low PT: Clotting disorder
High INR: Anticoagulation dose is too high
Low INR: Anticoagulation dose is too low
