Conalbumin-Specific IgE, Qualitative Radioallergosorbent Test (RAST) — Deprecated
A qualitative blood test for IgE directed against conalbumin, an egg protein. A positive result suggests sensitization but must be interpreted with symptoms and exposure history.
["A positive result suggests an immune reaction to conalbumin, but it does not by itself confirm a clinical allergy."]
Key facts at a glance
- LOINC
- 81981-3
- Short code
- Deprecated Conalb (nGal d) 3 IgE RAST Ql
- Synonyms
- Deprecated Conalb (nGal d) 3 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 is a radioallergosorbent test, or RAST, that looks for allergen-specific IgE directed against conalbumin, an egg protein. It is a qualitative test. This assay is marked as deprecated and may no longer be routinely available.
Why might I need this test?
The test may be used when a person has symptoms suggestive of an egg allergy, such as hives, swelling, wheezing, vomiting, or abdominal discomfort after eating eggs. It may also help evaluate suspected food-related allergic reactions.
How is the test performed?
A blood sample is collected, and the laboratory tests the specimen for IgE that binds to conalbumin. The RAST method uses a labeled allergen reagent to detect allergen-specific antibody binding.
How do I prepare for the test?
Fasting is generally not required for this blood test. Tell your healthcare professional about your symptoms, possible egg exposure, allergic reactions, and any medicines or treatments that could affect interpretation; do not stop prescribed medicines without medical advice.
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.
◆Associated findings1
Short name
Conalbumin IgE (RAST)
Frequently asked questions
Does a positive result mean I definitely have an egg allergy?
Can I have an egg reaction if this test is negative?
Why is this test listed as deprecated?
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