11dhTxB2/Creatinine (AspirinWorks)

Other names: 11-dhTXB2/Creatinine

Optimal result: 0 – 1500 pg/mg Cr

By Healthmatters Editorial Team

Peer-reviewed sources

Elevated levels of 11-dehydro thromboxane B2 (11-dhTXB2) in the AspirinWorks® test indicate that thromboxane A2 production is still high, despite aspirin therapy. This could mean a few different things:

→ Aspirin Resistance: The individual might be resistant to aspirin, meaning that their body does not respond to aspirin's effect on platelet function as expected. This resistance can be due to various factors, such as genetic variations, inadequate dosage, or interactions with other medications that counteract aspirin's efficacy.

→ Non-Compliance: The patient might not be taking their aspirin as prescribed, leading to insufficient inhibition of thromboxane A2 production. This could be intentional or accidental and is often checked by discussing medication adherence with the patient.

→ Metabolic or Pharmacokinetic Issues: Sometimes, the issue might be related to how the body metabolizes aspirin or the pharmacokinetics of how aspirin is absorbed, distributed, metabolized, and excreted. Certain medical conditions or concurrent use of other drugs can alter these processes.

Elevated levels of this biomarker serve as an alert that the aspirin therapy might not be providing the intended protection against thrombotic events such as heart attacks or strokes. This necessitates a reevaluation of the treatment strategy, which might include adjusting the aspirin dosage or switching to alternative antiplatelet therapies.

AspirinWorks® 11-Dehydrothromboxane B2 (11-dhTXB2) with Creatinine - Aspirin (which inhibits platelet cyclooxygenase) reduces the risk of thrombosis in cardiovascular disease by impairing platelet function. Patients who do not respond to the platelet inhibitory effects of aspirin are designated as "aspirin resistant". The measurement of 11-dhTXB2 in urine (the principal metabolite of platelet cyclooxygenase derived thromboxane B2) may be used in individuals with cardiovascular disease prior to initiation of aspirin therapy, or in individuals non-responsive to aspirin therapy.

AspirinWorks® (11-dehydro thromboxane B2/Creatinine, or 11-dhTXB2/Creatinine) is a unique biomarker used to evaluate the effectiveness of aspirin in inhibiting thromboxane production, which is crucial for platelet function and clot formation. This biomarker specifically measures the levels of 11-dehydro thromboxane B2 (11-dhTXB2) in the urine, which is a stable metabolic product of thromboxane A2, the molecule that aspirin targets to reduce platelet aggregation. By normalizing this measurement to creatinine, a byproduct of muscle metabolism consistently present in urine, the test provides a reliable assessment of thromboxane production on a per kidney filtration rate basis. The AspirinWorks® test is particularly useful for determining if patients on low-dose aspirin therapy are receiving the appropriate antiplatelet effect to prevent conditions like heart attacks and strokes. This test is crucial for identifying aspirin resistance, a condition where individuals do not respond to the standard antiplatelet effects of aspirin, thus allowing for adjustments in their therapeutic regimen. Understanding the level of 11-dhTXB2 can help healthcare providers make more informed decisions regarding aspirin dosing, potentially leading to better cardiovascular outcomes for patients at risk of thrombotic events.

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11dhTxB2/Creatinine (AspirinWorks)

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