Platform
Company
Complete Blood Count
Review status
Currently under review
Pending specialist review and validation.
This test evaluates how well your platelets clump together when exposed to arachidonic acid, using an electrical method called impedance aggregometry. As platelets activate and stick to each other, the electrical resistance in the sample changes, and that change is measured.
It is commonly used as part of a broader platelet function study. Because arachidonic acid triggers the same pathway targeted by aspirin, the test is particularly useful to check for expected aspirin effect or to investigate certain platelet function problems.
Results help your clinician understand whether your platelets are responding normally through the arachidonic acid pathway, whether a medication like aspirin is working as intended, or whether there may be a platelet function disorder. It can be ordered when there is unexplained easy bruising, nosebleeds, heavy menstrual bleeding, or before procedures where bleeding risk needs to be assessed.
It can also help evaluate unexpected bleeding while on antiplatelet therapy or confirm recovery of platelet function after stopping medicines that affect platelets. Decisions about stopping or continuing antiplatelet drugs are made by your clinician based on your overall health, reason for treatment, and the full set of test results.
Your report reflects how strongly your platelets aggregated in response to arachidonic acid. Lower-than-expected aggregation often indicates an aspirin effect or a problem in this platelet activation pathway. Higher or normal aggregation suggests little inhibition through this pathway. Interpreting this test is done alongside other platelet agonist tests, your medication list, and your clinical history.
If results do not match your symptoms or treatment plan, your clinician may review medications and supplements, repeat testing after avoiding interfering agents as advised, or order additional platelet studies. Abnormal results do not automatically mean you will bleed during procedures; they guide careful planning and should be discussed with your healthcare team.
Reference intervals vary by laboratory, analyzer, methodology, population, and units. The ranges shown here are for education only. Always interpret your results against the reference interval printed on your own lab report.
Aspirin directly targets the arachidonic acid pathway and can markedly reduce aggregation. Other agents like NSAIDs, P2Y12 inhibitors, and COX-2 inhibitors may also influence results. Never stop these without medical advice.
Platelet function is time sensitive. Delays in testing, incorrect anticoagulant, temperature extremes, or vigorous shaking can alter platelet responses and lead to misleading results.
Omega-3 fatty acids, ginkgo, garlic, turmeric, and alcohol can blunt platelet aggregation in some people. Always share supplement use and recent alcohol intake with your clinician.
Very low platelet counts, high or low hematocrit, and certain anemias can affect impedance measurements. Your provider will interpret results in the context of your complete blood count.
Infections, recent surgery, and inflammatory conditions can temporarily change platelet function. Testing during acute illness may not reflect your usual baseline.
Physiologic changes in pregnancy and use of hormonal therapies can influence platelet function. Tell your clinician if you are pregnant or using hormonal medications.
References