Platelet IgG Immunoassay (Serum/Plasma)
This test measures the presence of antibodies (IgG) against your platelets in your blood. It helps diagnose conditions where your immune system mistakenly attacks your own platelets, which can lead to bleeding problems.
["Assessing platelet antibodies can help identify causes of unexplained bleeding or low platelet counts."]
Key facts at a glance
- LOINC
- 13062-5
- Short code
- Platelet IgA Ser-aCnc
- Synonyms
- Platelet IgA Ser-aCnc
- 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
- 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 healthcare provider may recommend this test if you have symptoms like easy bruising, excessive bleeding (e.g., nosebleeds, heavy menstrual periods), or unexplained low platelet counts. It’s also used in patients with autoimmune disorders or those receiving blood transfusions.
What to Expect During the Test
A small needle will draw blood from a vein in your arm. The blood sample is then tested for platelet-specific IgG antibodies using an immunoassay method. The process usually takes about 15 minutes, and you may feel a brief pinch during the draw.
Sample Collection and Preparation
The test uses either serum (liquid part of blood after clotting) or plasma (liquid part of blood without clotting). No special preparation is needed, but avoid aspirin or other blood-thinning medications for 7–10 days before testing if instructed by your provider.
What the Results Mean
Results are qualitative (positive or negative) rather than numeric. A positive result indicates the presence of platelet-specific IgG antibodies, which may suggest an autoimmune condition affecting platelet function. Your doctor will interpret results in the context of your symptoms and other tests.
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.
Clinical Significance
Short name
IgG Platelet Antibody Test
Frequently asked questions
What are the normal reference ranges for this test?
How long does it take to get my test results?
Can I eat or drink 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