Imperial Collage Healthcare

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Platelet Aggregation Studies

Test Background
Platelet aggregation studies offer a qualitative assessment of platelet function in response to various agonists that stimulate platelet activation pathways. Platelet aggregation is rarely performed in isolation and is never used solely in the diagnosis of a bleeding disorder, rather it is interpreted in conjunction with other investigations such as Lumi Aggregation, PFA-100 testing and the clinical bleeding score.

Clinical Indications

Investigation of bleeding phenotype consistent with a possible platelet function disorder
Confirmation of previously diagnosed platelet function disorder

Reference Range
For advice with interpretation please contact the lab or haematology clinical team.

Sample Required
6-8 x 4.5 mL sodium citrate (pale blue top) adults 1.8 mL sodium citrate (pale blue top) paediatrics

Turnaround Time

4 hours – Testing is performed on the day of blood sampling.

For external users, reports will be available within 2 working days.


Please note: – Platelet aggregation requests must be approved by the haematology clinical team and booked with the lab prior to testing.

Please note: Samples will be rejected if under/over-filled, clotted or haemolysed

Please do not send samples via pod system

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