Dipyridamole-Induced Platelet Aggregometry with Platelet Function Analyzer
This test measures how well your platelets work to stop bleeding after being exposed to a drug called dipyridamole, which temporarily increases blood flow to your brain. It helps check if your platelets are functioning normally or if you may be at higher risk for blood clots.
["This test helps assess your risk of stroke or blood clots by evaluating platelet activity under stress."]
Key facts at a glance
- LOINC
- 73410-3
- Short code
- Dipyridamole ind plt IgM SerPl Ql FC
- Synonyms
- Dipyridamole ind plt IgM SerPl Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- flow-cytometry
- CPT
- 82784
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your doctor may order this test if you have a history of stroke, heart disease, or blood clots, or if you’re taking medications that thin your blood (like aspirin or clopidogrel). It can also help determine if you need adjustments to your blood-thinning treatment.
How the Test Works
You’ll receive a small dose of dipyridamole, which dilutes blood flow and makes platelets more active. A special device then measures how quickly platelets stick together to form clumps (aggregation). This helps identify if your platelets respond normally or poorly to blood-thinning effects.
What to Expect During the Test
The procedure is quick and painless. You’ll have a small needle inserted into your arm, and a small amount of blood will be drawn while the device monitors platelet activity. You may feel a slight pinch, but it won’t last long.
Preparation and Restrictions
Avoid aspirin or other blood-thinning medications for at least 5–7 days before the test, as they can interfere with results. Also, don’t smoke or drink coffee for 24 hours before testing, as these can affect platelet function.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal results may indicate poor platelet function, which could increase your risk of stroke or other clotting events. Doctors use these findings to tailor treatments, such as adjusting blood-thinning medications or exploring alternative therapies if needed.
Short name
Platelet Function Test (Dipyridamole Challenge)
Frequently asked questions
Will I feel any side effects from dipyridamole?
How long will I need to wait for my results?
Can I still take my blood-thinning medication before this 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