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Pinto Bean-Specific IgG Antibody, Qualitative (RAST) — Deprecated

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

A legacy blood test that looked for IgG antibodies to pinto bean, which may indicate previous exposure but does not by itself diagnose food allergy.

Quick summary

["This deprecated test detects pinto bean-specific IgG antibodies, but a positive result alone does not confirm an allergy."]

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

Key facts at a glance

LOINC
21101-1
Short code
Deprecated Pinto Bean IgG RAST Ql
Synonyms
Deprecated Pinto 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 is a qualitative blood test for IgG antibodies directed against pinto bean proteins. It was historically used to assess immune exposure to pinto beans and has been deprecated because it is no longer commonly ordered.

Why might I need this test?

The test may appear in older medical records or be used in the evaluation of a suspected food-related reaction. Its results need to be interpreted alongside symptoms, medical history, and other allergy testing.

How is the test performed?

A blood sample is collected, and a laboratory method is used to determine whether pinto bean-specific IgG antibodies are present. The result is generally reported as detectable or not detectable.

How do I prepare for the test?

No special preparation is usually required for a blood antibody test. Follow the instructions provided by your healthcare professional or laboratory, and tell the clinician about any food reactions, allergies, and medicines you are taking.

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

Pinto bean IgG test

Frequently asked questions

Does a positive result mean I am allergic to pinto beans?
No. A positive IgG result indicates exposure or sensitization and must not be used alone to diagnose a food allergy. Symptoms and other allergy testing are needed to assess clinical significance.
Is this test still routinely available?
This test is deprecated and is no longer commonly ordered. Ask your clinician which current test is appropriate if pinto bean allergy is a concern.
Can I use this result to decide whether to eat pinto beans?
Do not make that decision from this result alone. If you have had a reaction to pinto beans, discuss avoidance and an individualized allergy evaluation with your clinician.
  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