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Banana-Specific IgG Antibody, Qualitative (RAST)

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

A qualitative blood test that checks for IgG antibodies directed against banana proteins.

Quick summary

["This test detects banana-specific IgG antibodies, but a positive result does not by itself confirm a banana allergy."]

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

Key facts at a glance

LOINC
21090-6
Short code
Deprecated Banana IgG RAST Ql
Synonyms
Deprecated Banana 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 checks a blood sample for IgG antibodies that recognize proteins found in bananas. It is reported as a qualitative result, meaning antibodies are either detected or not detected.

Why might I need this test?

Banana-specific antibody testing may be included in an evaluation of suspected food sensitivity or a broader food-antibody panel. IgG results are often interpreted as evidence of exposure or immune tolerance rather than immediate allergy.

How is the test performed?

A blood sample is tested using an in vitro allergy-antibody method commonly called RAST. The laboratory determines whether banana-specific IgG antibodies can be detected in the sample.

How do I prepare for the test?

No special preparation is usually required. Avoid eating banana immediately before the blood draw only if the testing laboratory provides specific instructions, as food intake generally does not affect this result.

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

Banana IgG antibody test

Frequently asked questions

Does a positive result mean I am allergic to bananas?
No. Banana-specific IgG indicates an immune response to banana proteins but is not a reliable stand-alone marker of immediate allergy. Your clinician should interpret it alongside your symptoms and other allergy testing.
What if banana-specific IgG is not detected?
A negative result means the test did not detect this type of antibody. It does not completely exclude banana allergy or sensitivity, particularly if reactions are immediate or occur after eating banana.
How is this test different from a banana-specific IgE test?
IgG and IgE are different antibody classes. IgE is more closely associated with immediate, IgE-mediated food allergy, while food-specific IgG testing is generally less useful for diagnosing immediate allergy.
  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