Platelet Function Assay (with Platelet-Rich Plasma)
This test evaluates how well your platelets function in your blood, which is important for preventing excessive bleeding. It helps assess conditions affecting clotting or platelet activity.
["Checks how well your platelets work to stop bleeding."]
Key facts at a glance
- LOINC
- 6927-8
- Short code
- Platelet IgG Ser Ql FC
- Synonyms
- Platelet IgG Ser Ql FC
- Category
- hematology
- Sample
- serum
- Container
- Red-top tube (SST)
- 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
- Method
- flow-cytometry
- CPT
- 85049
- SNOMED
- 900000000000003003
- 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 Might Be Ordered
Your doctor may recommend this test if you have symptoms like easy bruising, prolonged bleeding from cuts, or unexplained nosebleeds. It’s also used before surgeries, if you’re taking blood-thinning medications, or if you have a history of clotting disorders.
How the Test Works
A small sample of your blood is taken and processed to create platelet-rich plasma. Specialized equipment then measures how platelets interact with blood clotting factors under controlled conditions. This helps determine if your platelets function normally or if there’s a problem.
What to Expect Before the Test
No special preparation is needed. You may have a slight bruise or discomfort at the needle site, but this is normal. Avoid aspirin or other blood-thinning medications for at least 5–7 days before testing, if possible, unless directed otherwise by your doctor.
What the Results Mean
Results help identify whether your platelets are functioning as they should. Abnormal results may indicate bleeding disorders, clotting issues, or medications affecting platelet activity. Your doctor will discuss these findings with you in detail.
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.
◆Associated findings1
Short name
Platelet Function Test
Frequently asked questions
What Are Common Causes of Abnormal Results?
How Long Does It Take to Get Results?
Can I Stop Taking Blood-Thinning Medications 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