Staphylococcus aureus Enterotoxin B-Specific IgE, Qualitative (RAST)
A qualitative blood test that detects IgE antibodies to Staphylococcus aureus enterotoxin B, which may indicate allergic sensitization.
["A positive result suggests the immune system is sensitized to this bacterial toxin, but it must be interpreted alongside symptoms and exposure history."]
Key facts at a glance
- LOINC
- 25823-6
- Short code
- Deprecated S aureus Etx B IgE RAST Ql
- Synonyms
- Deprecated S aureus Etx B 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 allergen-specific IgE antibodies directed against Staphylococcus aureus enterotoxin B in a blood sample. IgE is an immune-system protein associated with allergic reactions.
Why might I need this test?
It may be ordered when a person has symptoms suggestive of an allergy to Staphylococcus aureus enterotoxin B, particularly after exposure to contaminated food, wounds, or other sources. The result helps determine whether the immune system is sensitized to the toxin.
How is the test performed?
Blood is collected and the serum is analyzed using a laboratory allergen-specific IgE assay. The result is reported as positive or negative, sometimes with a reaction category that is interpreted according to the laboratory's method.
How do I prepare for the test?
No special preparation is usually required. Antihistamines and other medicines may affect allergy-test results, so tell your clinician what you are taking and do not stop prescribed medicines unless instructed to do so.
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 the presence of IgE antibodies to Staphylococcus aureus enterotoxin B and suggests immune sensitization. This does not by itself confirm that the toxin is causing a person's symptoms. A clinician should interpret the result with the exposure history, physical findings, and other allergy tests when appropriate.
Short name
S. aureus enterotoxin B IgE
Frequently asked questions
Does a positive result mean I have an active infection?
Do I need to stop taking allergy medicine before the test?
Can this result identify the cause of my symptoms?
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