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Prothrombin time
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prothrombin time INR interpretation mildly elevated PT 16.2 INR 1.26 patient information
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prothrombin time INR
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https://my.clevelandclinic.org/health/diagnostics/prothrombi…
Your report shows:
| Test | Result | Lab reference range | Interpretation |
|---|---|---|---|
| Prothrombin time (PT) | 16.2 seconds | 10.8-14.8 seconds | Mildly prolonged |
| Control PT | 12.8 seconds | - | - |
| INR | 1.26 | Report lists 0.5-1.5 | Usually near normal if not using warfarin |
Meaning: PT measures how long blood takes to clot through the extrinsic and common coagulation pathways. Your PT is only mildly high, meaning clotting took slightly longer than this laboratory’s usual range. A higher PT/INR can indicate slower clot formation and, when markedly elevated, increased bleeding tendency. The INR standardizes PT results between laboratories, as explained by the Cleveland Clinic PT/INR overview.
Important context
- If you are not taking warfarin: an INR of 1.26 is a small/borderline elevation in many labs and often needs only clinical correlation or a repeat test, especially if you have no bleeding symptoms.
- If you take warfarin: INR 1.26 is generally below the usual treatment target for many indications, often 2.0-3.0, but do not adjust the dose yourself. Contact the clinician managing it.
- Mild PT prolongation can occur with temporary dietary vitamin K changes, liver illness, malabsorption, alcohol use, some medicines or antibiotics, and less commonly clotting-factor deficiencies. One isolated mild result does not establish a diagnosis.
What to do
- Discuss it with the clinician who ordered it, particularly if this was pre-operative testing or if you use any anticoagulant.
- They may repeat PT/INR and, if needed, check CBC, liver-function tests, aPTT, medication history, and nutrition/vitamin K status.
- Seek urgent care for unusual or persistent bleeding, black stools, vomiting blood, severe headache after injury, or rapidly increasing bruising.
Do not start vitamin K supplements or stop prescribed blood thinners based on this result alone.
How is PT/INR interpreted if I take warfarin?
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warfarin INR target 2.0 3.0 mechanical heart valve guideline patient information
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warfarin INR target
If you take warfarin, the INR is the result used to guide treatment, not the PT in seconds. PT rises as warfarin reduces vitamin K-dependent clotting factors; INR standardizes that result across laboratories.
Your reported result
- PT: 16.2 seconds
- INR: 1.26
For most people prescribed warfarin, an INR of 1.26 is below the intended treatment range. It usually means the anticoagulant effect is too low, so protection against harmful clots may be inadequate.
| Reason for warfarin | Typical target INR | Interpretation of INR 1.26 |
|---|---|---|
| Atrial fibrillation, DVT, pulmonary embolism, many other indications | 2.0-3.0 | Below target |
| Many mechanical mitral valves | 2.5-3.5 | Well below target |
| Some mechanical aortic valves | Varies by valve and risk factors | Usually below target, except selected specialist-directed regimens |
Targets differ by your diagnosis, valve type, history of clotting/bleeding, and prescriber's plan. For example, expert guidance lists a target of 2.0-3.0 for most warfarin users and 2.5-3.5 for most mechanical mitral valves. Thrombosis Canada warfarin guide
What to do
- Contact your anticoagulation clinic or prescribing clinician today for dose instructions and timing of the next INR.
- Do not independently increase, double, stop, or skip warfarin.
- Tell them about missed doses, new medicines or antibiotics, vomiting/diarrhea, changes in alcohol intake, or major recent changes in vitamin K-containing foods. These can affect INR.
- Seek urgent care if you develop symptoms suggesting a clot: new one-sided leg swelling/pain, sudden chest pain or breathlessness, coughing blood, or stroke symptoms such as face droop, arm weakness, or speech difficulty.
A low INR generally raises concern for clotting, whereas a high INR raises concern for bleeding. Your own target INR on your warfarin record should take priority over general ranges.
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