Aspirin Resistance Blood Test

What is Aspirin resistance?

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.

RECOMMENDED TEST AspirinWorks® 11-Dehydrothromboxane B2 (11-dhTXB2) with Creatinine
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What causes aspirin resistance?

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.

What is the best test for aspirin resistance?

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.

When should I get tested for aspirin resistance?

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 are the symptoms of aspirin resistance?
Aspirin resistance typically has no direct symptoms because it is a laboratory finding rather than a condition you can feel. However, the consequences of aspirin resistance can manifest as cardiovascular events such as heart attacks, strokes, or blood clots despite taking aspirin regularly. You might notice chest pain, shortness of breath, sudden weakness, or numbness that suggests your aspirin therapy is not providing adequate protection against these serious complications.
Who is at risk for aspirin resistance?
People with diabetes, high cholesterol, chronic kidney disease, and inflammatory conditions are at higher risk for aspirin resistance. Those taking certain medications like NSAIDs or proton pump inhibitors may experience reduced aspirin effectiveness. Genetic factors also play a role, with some people inheriting variations in genes that control platelet function and aspirin metabolism. Smokers, obese individuals, and those with a history of cardiovascular disease despite aspirin therapy should consider testing for resistance.
What happens if aspirin resistance is left untreated?
Untreated aspirin resistance significantly increases your risk of heart attacks, strokes, and blood clots because your platelets continue to aggregate and form dangerous clots despite aspirin therapy. You may be falsely reassured that you are protected when you are actually at high cardiovascular risk. Detecting aspirin resistance early allows your doctor to adjust your treatment plan, potentially switching to alternative antiplatelet medications like clopidogrel or adding additional therapies to provide adequate protection against life-threatening cardiovascular events.
Can aspirin resistance be diagnosed with a blood test?
Aspirin resistance is diagnosed with a specialized blood test that measures 11-dhTXB2, a metabolite that reflects ongoing platelet activity and thromboxane production. This urine-based test provides a reliable indicator of whether aspirin is effectively blocking platelet aggregation. Unlike standard blood tests, this specialized assay specifically measures the biochemical pathway that aspirin targets, giving you and your doctor clear evidence about whether your aspirin therapy is working or if alternative treatments are needed for cardiovascular protection.
How is aspirin resistance treated?
Aspirin resistance is treated by adjusting medication regimens to ensure adequate antiplatelet protection. Your doctor may increase your aspirin dose, switch you to alternative antiplatelet medications like clopidogrel or ticagrelor, or add a second antiplatelet agent for dual therapy. Addressing underlying conditions like diabetes, high cholesterol, and inflammation can also improve aspirin responsiveness. Avoiding NSAIDs and ensuring medication compliance are critical steps in managing aspirin resistance and reducing your cardiovascular risk.
How can I prevent aspirin resistance?
Preventing aspirin resistance involves taking aspirin consistently as prescribed, avoiding NSAIDs that can interfere with aspirin's effectiveness, and managing underlying health conditions like diabetes and high cholesterol. Maintaining a heart-healthy lifestyle with regular exercise, a balanced diet rich in omega-3 fatty acids, and smoking cessation can improve platelet function and aspirin responsiveness. Regular monitoring with your healthcare provider ensures that your aspirin therapy remains effective, and testing can identify resistance early so treatment adjustments can be made promptly.
What lifestyle changes help with aspirin resistance?
Lifestyle changes that support cardiovascular health can improve aspirin effectiveness and reduce resistance. Focus on a Mediterranean-style diet rich in fruits, vegetables, whole grains, and omega-3 fatty acids from fish, which naturally support healthy platelet function. Regular physical activity improves circulation and reduces inflammation that can interfere with aspirin. Quit smoking, limit alcohol intake, manage stress through relaxation techniques, and maintain a healthy weight to optimize your body's response to aspirin therapy and lower your overall cardiovascular risk.
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AspirinWorks® 11-Dehydrothromboxane B2 (11-dhTXB2) with Creatinine
Google reviews 505 reviews
$436 $340
What's included
Fast & easy, results by email & SMS
No need to visit a doctor
Private & confidential
No insurance needed
Results explained
No extra fees paid at the lab

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