Platelet Antibody Screening by Platelet-Rich Plasma (PRP) Immunofluorescence
This test checks for antibodies that may be attacking your platelets, which help your blood clot. It uses a special blood sample to detect these antibodies, which could be linked to conditions like autoimmune disorders or bleeding problems.
["This screening helps identify if your immune system may be mistakenly targeting your platelets, potentially causing unusual bleeding or clotting issues."]
Key facts at a glance
- LOINC
- 15201-7
- Short code
- Platelets Lg Frg # Bld Manual
- Synonyms
- Platelets Lg Frg # Bld Manual
- 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
- Method
- manual-count
- 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
Why This Test Might Be Ordered
Your doctor may recommend this test if you’ve experienced unexplained bruising, bleeding, or frequent infections, especially if other blood tests (like platelet counts) seem normal. It’s also used in patients with autoimmune diseases or those undergoing treatments that could affect platelet function.
How the Test Works
A small amount of your blood is drawn and processed to create platelet-rich plasma (PRP). Fluorescent antibodies are added to detect any immune system proteins that might bind to your platelets, indicating potential platelet destruction or dysfunction.
What to Expect Before the Test
No special preparation is needed, but inform your doctor about any medications (especially blood thinners) or recent illnesses that might affect blood clotting. Avoid aspirin or NSAIDs for 7–10 days before testing if possible.
What to Expect During the Test
The procedure is quick and similar to a regular blood draw. You may feel a slight pinch, but it usually takes less than 5 minutes. The lab analyzes the PRP under a microscope to detect fluorescence, which confirms the presence of platelet antibodies if they’re present.
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.
Positive results suggest the presence of platelet antibodies, which can lead to thrombocytopenia (low platelet counts) or autoimmune thrombocytopenic purpura (ATP). Early detection helps guide treatment, such as steroids, IV immunoglobulin, or blood transfusions, to manage bleeding risks or improve platelet survival.
Short name
Platelet Antibody Screen (PRP IF)
Frequently asked questions
What Does a Positive Result Mean?
Will I Need More Testing If This Test Is Positive?
Can I Prevent Platelet Antibody Issues?
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