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Deprecated Eggplant-Specific IgG Antibody, Radioallergosorbent Test (RAST), Qualitative

Published: August 9, 2026Updated: August 17, 2026

A legacy blood test for eggplant-specific IgG antibodies. It is deprecated and does not reliably diagnose or rule out food allergy.

Quick summary

["A positive result shows possible exposure to eggplant but does not by itself mean you have an eggplant allergy."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
21255-5
Short code
Deprecated Eggplant IgG RAST Ql
Synonyms
Deprecated Eggplant 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 was a qualitative blood test designed to detect IgG antibodies directed against eggplant. It is now considered deprecated and is not routinely used for allergy evaluation.

Why might I need this test?

The test was historically ordered to evaluate a possible connection between food symptoms and eggplant exposure. Current allergy evaluation generally relies on the medical history, clinical testing, and sometimes skin-prick or IgE-specific testing when appropriate.

How is the test performed?

A blood sample would be tested using a radioallergosorbent-style method to look for eggplant-specific IgG. Because the assay is deprecated, it is unlikely to be available through current laboratories.

How do I prepare for the test?

No specific preparation was generally required beyond following the laboratory's instructions. If an old result is being reviewed, discuss it with a healthcare professional rather than changing your diet or treatment based on it alone.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

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

Eggplant-Specific IgG (Deprecated)

Frequently asked questions

Does a positive eggplant-specific IgG result mean I am allergic?
No. Food-specific IgG can occur without a clinically significant allergy, so this result alone should not be used to diagnose allergy or avoidance.
Why is this test considered deprecated?
Food-specific IgG testing has limited value for diagnosing immediate food allergy. Current evaluation is more likely to use the clinical history and, when indicated, skin-prick testing or food-specific IgE testing.
Should I stop eating eggplant because of a positive result?
Do not change your diet solely because of this result. Discuss any symptoms or concerns about eggplant with a healthcare professional or allergist.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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