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Aspirin resistance is a condition where the body does not respond adequately to aspirin's blood-thinning and antiplatelet effects, potentially reducing its protective benefits for cardiovascular health. It is caused by continued platelet aggregation and thromboxane production despite regular aspirin therapy. The AspirinWorks 11-Dehydrothromboxane B2 test is the most important test for diagnosis because it directly measures platelet activity and thromboxane metabolites.
Aspirin resistance is caused by genetic variations, increased platelet turnover, insufficient dosing, and non-compliance with aspirin therapy. Genetic polymorphisms affecting platelet receptors and cyclooxygenase enzymes can reduce aspirin's ability to block thromboxane production. Other factors include interactions with other medications like NSAIDs, inflammation, diabetes, and elevated cholesterol levels that interfere with aspirin's antiplatelet effects.
The AspirinWorks 11-Dehydrothromboxane B2 (11-dhTXB2) with Creatinine test is the most important test for aspirin resistance because it directly measures the metabolite of thromboxane B2, which reflects platelet activity and aggregation. When aspirin works effectively, it blocks thromboxane production and keeps platelet aggregation low. Elevated 11-dhTXB2 levels indicate that platelets continue to produce thromboxane despite aspirin therapy, confirming resistance. The creatinine measurement ensures accurate interpretation by accounting for kidney function, making this the gold standard for detecting whether your aspirin therapy is providing adequate heart protection.
You should get tested if you are taking daily aspirin for heart attack or stroke prevention but have experienced a cardiovascular event while on therapy, have a family history of heart disease despite aspirin use, or your doctor wants to verify that your aspirin regimen is working effectively. Testing is especially important if you have diabetes, high cholesterol, or chronic inflammation, as these conditions can interfere with aspirin's effectiveness and increase your risk of treatment failure.
What this means
Your 11-dhTXB2 level is elevated, suggesting that aspirin may not be fully blocking platelet activity in your body. This indicates possible aspirin resistance, meaning you might not be getting the full cardiovascular protection expected from your aspirin therapy. This finding is important to discuss with your doctor to optimize your treatment plan.
Recommended actions
Discuss your results with your doctor to consider adjusting aspirin dose or adding alternative antiplatelet therapy
Ensure you're taking aspirin consistently at the same time each day as prescribed
Avoid NSAIDs like ibuprofen which can interfere with aspirin's effectiveness
Retest in 4-8 weeks after any treatment adjustments to confirm improved response
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