Platform
Company
Complete Blood Count
Review status
Currently under review
Pending specialist review and validation.
This test evaluates how your platelets clump together when they are stimulated with adrenaline using an optical method called light transmission aggregometry. A blood sample is processed to make platelet‑rich plasma, then a standardized amount of adrenaline is added and the change in light passing through the sample is measured as platelets aggregate.
It is one part of a broader platelet function study and is usually performed alongside other agonists to provide a complete picture of how your platelets respond.
Platelet aggregation testing helps find causes of easy bruising, nosebleeds, heavy menstrual bleeding, or bleeding after procedures when a platelet problem is suspected. It can also show whether medicines that affect platelets are influencing your clotting function, or help evaluate for inherited or acquired platelet function disorders.
Results guide your care team on next steps before surgery, during evaluation of bleeding symptoms, or when monitoring the impact of antiplatelet drugs.
Your result is interpreted with your history, medication use, and responses to other agonists in the panel. A reduced response can reflect the effect of medicines such as aspirin or a platelet secretion defect, while other patterns may point to different platelet function conditions.
If results are unexpected, your clinician may review your medications and supplements, consider repeating the test after a washout period, or order complementary studies to clarify the cause.
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, P2Y12 inhibitors, nonsteroidal anti‑inflammatory drugs, and GP IIb/IIIa inhibitors can blunt the adrenaline response. Your care team may recommend a medication review and a safe washout period before testing.
Fish oil, ginkgo, garlic, and certain herbal blends can affect platelet function. Always tell your clinician about all supplements so they can advise whether to pause them ahead of testing.
Platelet‑rich plasma must be prepared and tested promptly at controlled temperature. Delays, agitation, incorrect tube fill, or extreme temperatures can alter the optical signal and skew results.
Very low platelet counts or markedly abnormal hematocrit can change light transmission and confound interpretation. Laboratories often verify these values and may adjust or defer testing if needed.
Recent caffeine or nicotine use, alcohol intake, and strenuous exercise can transiently change platelet reactivity. Following pretest instructions helps avoid misleading results.
Acute illness, infection, inflammation, liver or kidney disease, and thyroid disorders can influence platelet responses. Your clinician will consider these when interpreting the pattern.
Physiologic changes in pregnancy and age‑related differences can affect platelet function. Interpretation takes these into account and may rely on patterns across multiple agonists.
Conditions such as von Willebrand disease or inherited platelet function defects can produce abnormal aggregation patterns. Additional targeted tests may be needed to confirm a diagnosis.
References