Deprecated Codfish IgE Antibody, Serum — Radioallergosorbent Test, Qualitative
A qualitative blood test that detects IgE antibodies directed against codfish, a marker of an immediate fish allergy.
["A positive result may indicate an IgE-mediated allergy to codfish, but it must be interpreted with your symptoms and exposure history."]
Key facts at a glance
- LOINC
- 15650-5
- Short code
- Deprecated Codfish IgE RAST Ql
- Synonyms
- Deprecated Codfish 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 IgE antibodies to codfish proteins in your blood. IgE is the type of antibody most often involved in immediate, food-related allergic reactions.
Why might I need this test?
It may be considered if you develop hives, swelling, wheezing, vomiting, or other symptoms soon after eating codfish. The result is also useful when your history does not clearly identify which fish caused a reaction.
How is the test performed?
A serum sample is analyzed with a radioallergosorbent-style laboratory method. This older qualitative test reports whether codfish-specific IgE was detected rather than providing a numeric concentration.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about your symptoms, recent fish exposure, and any known fish allergy. If you take antihistamines, ask whether they should be temporarily stopped because they can affect allergy testing.
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 IgE directed against codfish was detected and may support an immediate, IgE-mediated fish allergy. A negative result makes this allergy less likely but does not completely exclude it, particularly if symptoms are caused by another fish or a non-IgE reaction.
Short name
Codfish IgE antibody test
Frequently asked questions
Does a positive result mean I will always react to codfish?
Can I have a fish allergy without reacting to codfish?
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