Peanut-Specific IgE Antibody, Qualitative
A blood test that detects antibodies directed against peanut proteins. It may help evaluate possible IgE-mediated peanut allergy.
["A positive result shows peanut-specific IgE antibodies, but it must be interpreted with symptoms and other clinical findings."]
Key facts at a glance
- LOINC
- 15917-8
- Short code
- Deprecated Peanut IgE RAST Ql
- Synonyms
- Deprecated Peanut IgE RAST Ql
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 500 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- CPT
- 84484
- SNOMED
- 302774002
- 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
What is this test?
This test looks for peanut-specific IgE antibodies in a blood sample. These antibodies are part of the immune response to peanut proteins.
Why might I need this test?
It may be used when a person has symptoms suggesting an IgE-mediated peanut allergy, such as hives, swelling, wheezing, vomiting, or other immediate reactions after eating peanuts. The result is considered together with the clinical history and other allergy testing.
How is the test performed?
A blood sample is collected and tested in a laboratory for peanut-specific IgE using an immunoassay-based method. The test is reported as positive or negative, or with a laboratory measurement when applicable.
How do I prepare for the test?
No special preparation is usually required for a routine blood draw. Follow the instructions provided by the laboratory or clinician, and tell the healthcare team about any recent allergic symptoms, food exposures, or medicines that could affect interpretation.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
A positive result indicates that peanut-specific IgE antibodies are present and may support a diagnosis of IgE-mediated peanut allergy. It does not by itself prove that symptoms will occur with peanut exposure, and a negative result does not completely exclude allergy. Results should be interpreted by a clinician alongside symptoms, exposure history, and sometimes additional testing.
Short name
Peanut-Specific IgE
Frequently asked questions
Does a positive result mean I am allergic to peanuts?
Can this test diagnose a peanut allergy on its own?
Should I stop eating peanuts 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 17, 2026. · Read our editorial policy