Platelet Aggregation (or Clumping) Assay in Whole Blood
This test measures how platelets in your blood clump together when exposed to certain triggers, helping assess your risk of blood clots or bleeding disorders.
["This test helps evaluate platelet function and potential clotting risks."]
Key facts at a glance
- LOINC
- 104700-0
- Short code
- Platelet Clump Bld Ql
- Synonyms
- Platelet Clump Bld Ql
- Category
- hematology
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 150
- Ref high
- 400
- Critical range
- 50 N/A – 1000 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 85049
- SNOMED
- 900000000000003003
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
Platelets are tiny cells in your blood that help stop bleeding by clumping together to form clots. This test checks how well they clump under controlled conditions, often using a substance like adenosine diphosphate (ADP) or collagen to simulate natural triggers.
Why Might You Need This Test?
You may need this test if you have symptoms like unexplained bruising, prolonged bleeding, or a history of clots. Doctors also use it to monitor treatments for conditions like thrombocytopenia (low platelet count) or blood clotting disorders.
Common Uses in Medical Care
This test is commonly used in diagnosing or monitoring bleeding disorders, platelet dysfunction, or evaluating responses to medications that affect platelet activity, such as antiplatelet drugs.
What to Expect Before the Test
No special preparation is usually needed, but your doctor may ask you to stop certain medications (like aspirin) for a few days before testing, as they can affect platelet function.
Reference range
Adult: 150-400 x 10^9/LN/A
No special preparation required. Stay well hydrated.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Platelet clumping is critical for diagnosing conditions like von Willebrand disease, Bernard-Soulier syndrome, or Glanzmann’s thrombasthenia, where platelets don’t clump properly. It also helps assess bleeding risks in patients on anticoagulants or antiplatelet therapies.
Short name
Platelet Clumping Test (bld)
Frequently asked questions
How is the test performed?
What do the results mean?
Can I eat or drink before the test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy