New England · Prothrombin Test: Prothrombin Time PT with INR
Prothrombin Test: Prothrombin Time PT with INR in New Hampshire
Prothrombin Test: Prothrombin Time PT with INR is a laboratory test you can request directly. This test evaluates how quickly your blood clots and assesses key proteins involved in the clotting process.
Typical turnaround1-3 business days
Price range$29
PreparationFollow the lab's instructions.
Sample typeBlood draw at a collection lab
ReferralNo referral required
What this test is
The Prothrombin Time (PT) test, often reported with the International Normalized Ratio (INR), measures the time it takes for blood to form a clot. It checks the function of certain proteins in your blood that are essential for clotting.
What it measures
Prothrombin Time (PT) — reflects the time it takes for blood to clot
International Normalized Ratio (INR) — standardizes PT results for comparison across different labs
Activated Partial Thromboplastin Time (aPTT) — measures the time it takes for blood to clot through a different pathway
What the test involves
This test requires a blood sample, which is typically drawn from a vein in your arm using a needle.
Why it is often ordered
Clinicians may order this test to monitor blood-thinning medications, such as warfarin, or to investigate bleeding disorders. It helps assess the overall function of your blood's clotting system.
Preparation
Please follow any specific preparation instructions provided by the laboratory where your blood will be drawn. Some labs may ask you to fast before the test.
How results are reported
Your results will indicate how long it took your blood to clot and will include an INR value. Reference ranges for these results can vary between laboratories.
Before you go
Specific preparation instructions
Estimated turnaround time for results
Whether fasting is required
Cities
Prothrombin Test: Prothrombin Time PT with INR in New Hampshire communities
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