Platelet Aggregation with Arachidonic Acid, 5uM (Luminescence)

This test checks how your platelets clump together and release chemical signals when exposed to arachidonic acid, using a luminescence method to detect secretion. It is one component of a platelet function study and targets the same pathway affected by aspirin.

The arachidonic acid challenge helps evaluate the cyclooxygenase-1 pathway and dense granule release. Results are interpreted with your clinical history and often alongside other platelet agonists to provide a fuller picture of platelet function.

Doctors use this test to investigate easy bruising, nosebleeds, heavy menstrual bleeding, or unexpected bleeding with procedures. It helps detect the effect of medicines like aspirin that block the arachidonic acid pathway, and it can point to certain inherited or acquired platelet secretion defects.

The findings can guide decisions about stopping or adjusting medications before surgery, assessing bleeding risk, and planning further testing. When combined with other platelet function results, it helps distinguish drug effects from underlying platelet disorders.

A reduced response to arachidonic acid commonly reflects the effect of aspirin or similar drugs, but it can also be seen in some platelet secretion or pathway disorders. A near-normal response suggests intact function of the tested pathway, though other platelet pathways may still need evaluation.

If your result is unexpected, your clinician may review all medications and supplements, consider repeating testing after an appropriate washout period, and compare with responses to other agonists. Results are interpreted together with your symptoms, blood counts, and any planned procedures to decide on next steps.