Platelet Aggregation, Thrombin with Luminescence

This test checks how your platelets clump together and release stored chemical signals when exposed to thrombin, a powerful activator of platelets. It uses a luminescence probe that emits light when platelets release ATP from their dense granules, while also tracking how platelets aggregate in the testing cuvette.

The method, called lumi-aggregometry, is performed on platelet-rich plasma prepared from your blood. By looking at both the aggregation pattern and the secretion signal, the laboratory can assess thrombin-triggered receptor pathways and the ability of your platelets to release granule contents.

Your clinician may order this test if you have symptoms suggesting a platelet function problem, such as easy bruising, nosebleeds, gum bleeding, heavy menstrual bleeding, or unexpected bleeding with procedures. It is also used when other platelet studies point to a possible secretion defect, such as dense granule deficiency, or to clarify the cause of abnormal platelet function.

Results help distinguish inherited platelet function disorders from acquired causes, guide additional testing, and inform planning for surgery or dental work. Medicines that affect platelet activation or secretion can alter the thrombin response, so the test can reveal medication effects and help with timing or adjustments before procedures.

A typical result suggests that your platelets can both aggregate and release granule contents when stimulated by thrombin. A weak secretion signal, reduced aggregation, or a mismatch between aggregation and secretion may point to a secretion defect, a signaling problem, medication effects, or specimen issues.

Your clinician will interpret the findings alongside your symptoms, exam, blood counts, and results with other platelet agonists. Sometimes the study is repeated under controlled conditions or expanded with additional tests, such as electron microscopy for dense granules or flow cytometry of platelet receptors. If an acquired cause is suspected, your care team may review medications, treat underlying illness, and plan the safest approach for any procedures.