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Soybean Gly m 5 IgE Antibody [Units/volume] in Serum

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

This blood test measures IgE antibodies directed against Gly m 5, a major soybean allergen. It can help assess soybean sensitization when considered alongside symptoms and medical history.

Quick summary

["A positive result indicates IgE sensitization to the soybean allergen Gly m 5, but it must be interpreted with the clinical history."]

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

Key facts at a glance

LOINC
103078-2
Short code
Soybean (nGly m) 5 IgE RAST
Synonyms
Soybean (nGly m) 5 IgE RAST
Category
glucose
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
Method
rast
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 the Test Measures

The test detects allergen-specific IgE antibodies to Gly m 5, a soybean storage protein. These antibodies are part of the immune response that can occur after exposure to soybean.

Why the Test May Be Ordered

It may be ordered when a person has symptoms suggestive of a food allergy after eating soy, such as hives, swelling, wheezing, vomiting, or other immediate reactions. The result is reviewed by a clinician in context.

Understanding a Positive Result

A positive result means that IgE antibodies to Gly m 5 are present. This supports sensitization but does not by itself confirm that the antibody is causing symptoms or predict the severity of a reaction.

Limitations and Follow-Up

This test does not detect every possible soybean allergy or measure how much soy a person can safely eat. IgE may also remain detectable after a reaction, so results should be interpreted by a qualified healthcare professional, often an allergist.

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

Soybean Gly m 5 IgE

Frequently asked questions

Does a positive result mean I am allergic to soy?
It indicates IgE sensitization to Gly m 5, but it does not alone establish a clinical soy allergy. Your healthcare professional will interpret it with your symptoms, exposure history, and other testing.
Can someone with a soy allergy have a negative result?
Yes. A negative result means that IgE to Gly m 5 was not detected, but a reaction could still be caused by another soybean allergen or a non-IgE mechanism.
Does the test show how severe my allergy may be?
No. The antibody result cannot reliably predict reaction severity or the amount of soy that is safe. An allergist should provide individualized avoidance and emergency-management guidance.
  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