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Clotting Factor Platelet Function by Platelet Aggregometry with Platelet-Rich Plasma

Published: August 9, 2026Updated: August 16, 2026

This test measures how well your platelets work to help your blood clot. It uses a sample of your blood drawn into a tube that separates out the platelets for testing.

Quick summary

["Understanding your platelet function helps doctors check for bleeding risks or clotting disorders."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
96686-1
Short code
Clt Frm+Plt Fnc Gls Ind Pnl Bld MicrVisc
Synonyms
Clt Frm+Plt Fnc Gls Ind Pnl Bld MicrVisc
Category
hematology
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
microviscometry
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

Doctors may order this test if you have unexplained bruising, bleeding, or clotting problems. It can also help diagnose conditions like von Willebrand disease or aspirin-related bleeding risks.

What to Expect Before the Test

No special preparation is needed. You’ll have a small needle inserted into a vein (usually in your arm) to draw blood. The blood is then processed to isolate platelet-rich plasma for testing.

What the Test Results Mean

Results show how platelets clump together when exposed to certain triggers. Abnormal responses may indicate issues with platelet function or underlying bleeding disorders.

Common Conditions Affecting Results

Conditions like aspirin use, certain medications, or inherited bleeding disorders (e.g., von Willebrand disease) can affect platelet function test results.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

This test helps identify whether bleeding problems stem from platelet dysfunction rather than other blood components, guiding treatment decisions like medication adjustments or therapy.

Short name

Platelet Function Test (PRP)

Frequently asked questions

Will I feel pain during the blood draw?
You may feel a slight pinch or discomfort during the needle insertion, but it’s usually brief. Most people tolerate it well. Ask your doctor if you have concerns about pain management.
How long does it take to get my results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will discuss them with you during your follow-up visit.
Can I eat or drink before this test?
You can eat and drink normally before the test, as no fasting is required. However, follow any specific instructions your doctor provides for your condition.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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