What this test is
The test measures how long blood takes to clot through the extrinsic pathway. Prolongation may follow vitamin K deficiency, liver disease, warfarin use or clotting factor abnormalities.
Category: Clinical Chemistry
Prothrombin Time (PT)
PT is a clotting test commonly reported as INR. It is used to monitor warfarin treatment and, in some cases, to assess liver function.
What it is used for, and who should test
- Monitoring warfarin and adjusting the dose into the target range
- Assessing liver function and clotting factor production
- Pre-operative checks in patients at risk of bleeding
Sample and preparation
- Sample
- 2-3 mL of blood in a 3.2% sodium citrate tube (light blue top)
- Preparation
- No fasting required. Mention warfarin, other anticoagulants or vitamin K supplements.
Where to get tested
Samples are collected and results issued at S.F. Laboratory, the in-house laboratory of BK5 Med Health Clinic in Don Hua Lo, Chon Buri. No appointment is needed; walk in during opening hours.
- Sample collection at BK5 Clinic, 149/6-7 Don Hua Lo, Chon Buri District, Chon Buri 20000
- Open Monday-Friday 08.30-20.00 and Saturday 08.30-17.00
- Ask questions or book ahead on LINE @824xsgsj or call 063-223-6161
The information on this page is general knowledge to support your decisions and is not personal medical advice. Interpreting results and planning treatment requires assessment by a doctor. Please consult our medical staff before deciding on testing or treatment.
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Clinical Chemistry
Frequently asked questions about this test
What is the target INR?
It depends on why warfarin is prescribed. Most patients have a moderate target, while those with mechanical valves or previous clots may need a higher one; your doctor sets it.
Why is PT checked so often on warfarin?
Because drug levels are affected by food and other medicines. Regular checks keep the dose safe and reduce the risk of bleeding or clots.
How should I prepare for Prothrombin Time (PT)?
No fasting required. Mention warfarin, other anticoagulants or vitamin K supplements.
How long do results take?
About 1 day, depending on the laboratory workload that day. Our staff will confirm the collection time when you are served.
Where can I have this test done?
Samples are collected and results issued at S.F. Laboratory, the in-house laboratory of BK5 Med Health Clinic in Don Hua Lo, Chon Buri. No appointment is needed; walk in during opening hours.
How much does Prothrombin Time (PT) cost?
Prices are not shown on this website. Ask for pricing and packages on LINE @824xsgsj or call 063-223-6161.
Contact us
Book a visit or ask a question
Add us on LINE @824xsgsj to ask about tests and pricing, or fill in the form below and our team will get back to you as soon as possible.
Phone
063-223-6161LINE Official
@824xsgsj
Address
149/6-7 Don Hua Lo, Chon Buri District, Chon Buri 20000, Thailand
Get directions (Google Maps)Opening hours
- Monday - Friday
- 08.30 - 20.00
- Saturday
- 08.30 - 17.00