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Choose collection locationHaematology · Individual laboratory test
A platelet count measures the number of circulating platelets involved in forming a clot. It is distinct from tests that assess how well platelets function.
Clinical authorDr Nirupama SabhapathySpecialist Clinical Pathology
Understanding the test
Also called Clotting Cells (Platelets)
Platelets may be measured during the investigation of bruising or while monitoring a treatment that could affect blood cell production.
The platelet number helps a clinician assess bruising, bleeding or a finding on an earlier CBC.
A repeat sample or blood film may clarify unexpected platelet clumping.
Before your sample
No fast is needed. Tell the team about unusual bleeding, blood thinners and any previous laboratory comment about platelet clumping; use prescribed medicines as directed.
The clinician takes blood from a vein into a tube that keeps it from clotting. The collection team sends the labelled specimen to the laboratory.
Smart Report
24 hoursLaboratory turnaround
The number and platelet function are separate matters. Occasionally platelets clump in a specimen, and the laboratory may request another sample to clarify a low count.
From sample to follow-up

Choose your location, add the test to your care bag and select a time. If you are booking for someone else, assign the test to them in checkout.
Choose collection locationLook for Platelet Counts in your report. Use the sample type and collection time when comparing it with an earlier report.
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Check for a comment about clumping on the report and mention any bruising, bleeding or medicine that affects platelets.
Patient questions
No. The platelet number may be normal when their function or another part of the clotting system is affected. Discuss persistent bleeding or bruising with a clinician.
Dengue is one of the viral infections that can lower the platelet count sharply, and a falling count raises the risk of bleeding. Repeating the platelet count helps your doctor follow the illness and decide how closely you need to be watched. Report any new bruising, bleeding gums or skin spots at the time of the test.
Platelets can rise after infection, inflammation, bleeding or surgery. This is called reactive thrombocytosis. The count usually falls as the underlying cause resolves. If it stays high on repeat testing, your clinician can investigate other causes.
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Written by Dr Nirupama Sabhapathy, Specialist Clinical Pathology. Medically reviewed by Dr Joyce Jose, Specialist Clinical Pathology, on .
Catalogue information and AED price checked on 2 November 2026. Clinical suitability, preparation, collection arrangements and turnaround are confirmed for your selected test.