Celery-Specific Immunoglobulin G (IgG), Qualitative Radioallergosorbent Test (RAST)
A qualitative blood test that detects antibodies directed against celery proteins. A positive result shows immune sensitization or exposure but does not by itself confirm a celery allergy.
["This test can identify a celery-specific immune response, but it cannot diagnose allergy on its own."]
Key facts at a glance
- LOINC
- 21152-4
- Short code
- Deprecated Celery IgG RAST Ql
- Synonyms
- Deprecated Celery IgG 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 legacy RAST test evaluates whether a blood sample contains IgG antibodies directed against proteins found in celery. The result is reported as detectable or not detectable.
Why might I need this test?
It may have been ordered to investigate a possible food-related immune reaction. Results are best considered alongside symptoms, exposure history, and other allergy testing.
How is the test performed?
A blood sample is tested in a laboratory for antibodies that bind to celery proteins. The laboratory reports whether celery-specific IgG was detected.
How do I prepare for the test?
No special preparation is usually required. Follow any instructions from the ordering clinician, particularly if other allergy tests or medication changes are planned.
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 detectable result indicates that the immune system has produced IgG antibodies in response to celery proteins, but it does not establish that a person has a clinical celery allergy. This test format is deprecated, and RAST is more commonly associated with allergen-specific IgE testing, so the ordering clinician should confirm the exact assay performed and interpret the result with the full clinical picture.
Short name
Celery-Specific IgG (RAST)
Frequently asked questions
Does a positive result mean I am allergic to celery?
Is this the same as a skin-prick allergy test?
Can this test confirm a food allergy?
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