Platelet Function Assay Using Platelet Aggregation Monitoring with Clopidogrel
This test measures how well your platelets function after taking clopidogrel, a medication that helps prevent blood clots. It helps doctors check if the drug is working properly in your body.
["Assesses whether clopidogrel effectively reduces your risk of blood clots by evaluating platelet activity."]
Key facts at a glance
- LOINC
- 73029-1
- Short code
- Clopidogrel (neut) IgM SerPl Ql FC
- Synonyms
- Clopidogrel (neut) IgM SerPl Ql FC
- Category
- chemistry
- 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’re taking clopidogrel (e.g., for heart or blood vessel conditions) and want to confirm the medication is working as intended. It’s also used to monitor response in patients with clotting disorders or after procedures like stent placement.
How the Test Works
A small sample of your blood is taken and tested to measure how platelets clump together (aggregate) in response to clopidogrel. The test detects changes in platelet activity by observing how quickly they stick together under controlled conditions.
What to Expect Before the Test
No special preparation is needed, but inform your doctor if you’re taking other blood-thinning medications or have recent bleeding. Avoid aspirin or NSAIDs (e.g., ibuprofen) for at least 5–7 days before testing, as they can affect platelet function.
What the Results Mean
Results help determine if clopidogrel is providing adequate anti-clotting protection. Low platelet aggregation suggests the drug is working well, while high levels may indicate insufficient response or resistance to the medication.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Low platelet aggregation is critical for preventing clots in patients at risk (e.g., after heart surgery, stroke, or peripheral artery disease). If the test shows inadequate response, your doctor may adjust your dose or explore alternative medications to improve clotting control.
Short name
Clopidogrel Platelet Function Test
Frequently asked questions
What does a ‘good’ result mean?
Can I stop taking clopidogrel if my test results look normal?
How often should I get 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