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Red Kidney Bean-Specific IgG Antibody, RAST, Qualitative

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

A qualitative test for antibodies directed against red kidney bean proteins. The specimen is not specified, and RAST is more commonly used for IgE testing.

Quick summary

["This test may indicate prior exposure to kidney bean proteins, but it does not by itself confirm a symptomatic food allergy."]

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

Key facts at a glance

LOINC
21099-7
Short code
Deprecated Red Kidney Bean IgG RAST Ql
Synonyms
Deprecated Red Kidney Bean 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 test looks for IgG antibodies against proteins found in red kidney beans. Such antibodies can reflect previous exposure to this food. The abbreviation in the test name indicates a qualitative RAST-style assay, although RAST is more commonly associated with IgE antibody testing.

Why might I need this test?

It may be ordered when a history of kidney bean exposure, food-related symptoms, or suspected food sensitivity is being evaluated. The result should be considered together with symptoms, other allergy tests, and the foods you have recently eaten.

How is the test performed?

A blood sample is tested for antibodies that bind to red kidney bean proteins. The assay reports a qualitative result, such as positive or negative, rather than a measured concentration. The laboratory should confirm whether the test is being performed on serum or plasma.

How do I prepare for the test?

No special preparation is usually required for a single antibody test. If you have recently eaten kidney beans or other beans, tell the laboratory because recent exposure may affect the result. Do not stop foods or prescribed treatments solely because of this test without medical advice.

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

Kidney bean IgG antibody test

Frequently asked questions

Does a positive result mean I am allergic to kidney beans?
Not necessarily. A positive IgG result usually indicates prior exposure, while food allergy is more appropriately assessed using symptoms, medical history, and sometimes IgE-based testing.
What does a negative result mean?
It means detectable antibodies were not found at the time of testing. A negative result may occur if you have not recently been exposed or if the test does not detect the relevant antibody response.
Do I need to avoid kidney beans based on this result?
Do not change your diet based only on this result. Discuss it with your clinician, especially if you have hives, swelling, breathing difficulty, vomiting, or other symptoms after eating beans.
  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