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Blueberry-Specific IgG Antibody, Qualitative (RAST) — Deprecated

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

A historical qualitative test for IgG antibodies to blueberry proteins. A positive result does not by itself confirm a blueberry allergy.

Quick summary

["This deprecated test detects blueberry-specific IgG, which may reflect dietary exposure or tolerance rather than allergy."]

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

Key facts at a glance

LOINC
21115-1
Short code
Deprecated Blueberry IgG RAST Ql
Synonyms
Deprecated Blueberry 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 laboratory test designed to detect IgG antibodies directed against blueberry proteins. The test name includes RAST, a legacy term used for allergen-antibody testing.

Why might I need this test?

It may have been used to evaluate a reported reaction to blueberries or investigate possible food-related immune sensitivity. Because this test is deprecated, a clinician may recommend a more current allergy evaluation instead.

How is the test performed?

A patient specimen is exposed to blueberry allergen in the laboratory, and the test reports whether blueberry-specific IgG is detected. Laboratories that still offer a related test may use a different, non-RAST method.

How do I prepare for the test?

No special preparation is usually required for this type of antibody test. Follow the laboratory's collection instructions and tell the healthcare provider about recent blueberry consumption, medications, and any suspected allergic reaction.

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

Blueberry-Specific IgG Antibody Test

Frequently asked questions

Does a positive result mean I am allergic to blueberries?
No. Blueberry-specific IgG may reflect previous exposure or tolerance and does not by itself establish an allergy. Your clinician will interpret the result alongside your symptoms and other relevant testing.
Why is this test called deprecated?
Deprecated means the test is no longer routinely available or is considered outdated. A current food-allergy evaluation is usually preferred when clinically appropriate.
What should I do if I have a suspected blueberry allergy?
Discuss the reaction with a healthcare professional or allergist and avoid the suspected food until you receive guidance. Seek emergency care for trouble breathing, throat swelling, faintness, or a rapidly progressing reaction.
  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