Prothrombin Time Studies
General · Blood
Available in:Hisar
Available at 1 lab
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₹300₹270
About this test
What is Prothrombin Time (PT)?
Prothrombin Time is a blood test that measures how long it takes your blood to clot. It evaluates the function of several clotting factors (I, II, V, VII, X) that are produced mainly by the liver.
Key Parameters
| Parameter | What it shows |
|---|---|
| PT (seconds) | Overall clotting speed |
| INR (International Normalized Ratio) | Standardized PT value that allows comparison across labs |
Why is it done?
- Routine check before surgery or anticoagulant therapy
- Monitoring patients on warfarin or other oral anticoagulants
- Evaluating unexplained bleeding or bruising
- Screening for liver disease or vitamin K deficiency
Early Detection
PT can help identify signs of clotting disorders or liver dysfunction, but it does not diagnose on its own. A doctor interprets the result with symptoms, history, and other tests.
What does an abnormal result mean?
- High PT/INR: slower clotting – may indicate liver disease, vitamin K deficiency, or anticoagulant therapy
- Low PT/INR: faster clotting – can be seen in certain clotting factor deficiencies or liver disease Many factors such as hydration, diet, medications, and recent surgery can affect the result.
Who might need this test?
- Patients on anticoagulant medication
- Individuals with unexplained bleeding or bruising
- Those with liver disease or suspected liver dysfunction
- Pre‑operative assessment for surgery
Quick Takeaway
PT measures clotting speed and helps monitor anticoagulants and liver function. It is one piece of a larger diagnostic picture.
Used for detecting / monitoring
Before your test
Preparation
- Fasting: No fasting required for PT/INR.
- If combined with fasting tests: Follow the longest fasting period required among the tests.
- Procedure: A healthcare professional will draw a small amount of blood from a vein in your arm using a needle. The process takes about 5 minutes.
- What to expect: A brief pinch or sting when the needle is inserted; the sample is collected in a tube and sent for analysis.
- Precautions: Inform the lab if you are taking anticoagulants, vitamin K supplements, or have liver disease. Avoid alcohol and strenuous exercise 24 hours before the test if you are on anticoagulants.
- Note: Confirm specific preparation instructions with your doctor or the lab. This information is for educational purposes only and not a substitute for professional medical advice.
Sample type: Blood
Report parameter guide
Prothrombin Time
Measures how long it takes blood to clot, reflecting liver function and vitamin K status
Low: May indicate clotting factor deficiency, liver disease, vitamin K deficiency, or use of anticoagulants
High: May indicate liver dysfunction, vitamin K excess, or presence of clotting inhibitors