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Soybean rGly m4 IgE Allergen-Specific Antibody Test

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

This blood test measures IgE antibodies directed against the soybean allergen component rGly m4. A positive result indicates immune sensitization to soybean and must be interpreted alongside symptoms and exposure history.

Quick summary

["A positive result suggests soybean sensitization, but it does not by itself confirm a clinical soybean allergy."]

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

Key facts at a glance

LOINC
103064-2
Short code
Soybean (rGly m) 4 IgE RAST
Synonyms
Soybean (rGly m) 4 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 associated with an immune response to the soybean protein rGly m4. These antibodies are produced by the immune system after exposure to soybean.

How the result is interpreted

A detectable result generally supports sensitization to this soybean component. The clinical meaning can vary because some people have positive antibodies without symptoms, while reactions may also be caused by other soybean proteins.

Symptoms and medical history

Your clinician will consider whether you have symptoms such as hives, swelling, wheezing, vomiting, or digestive discomfort after eating soybean. The timing, amount eaten, and type of reaction are important when interpreting the result.

Next steps

Do not intentionally challenge yourself with soybean unless advised by an allergist. Your clinician may recommend allergy evaluation, skin-prick testing, or supervised oral food testing when the history and antibody result do not agree.

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 rGly m4 IgE

Frequently asked questions

Does a positive result mean I have a soybean allergy?
Not necessarily. It shows that your immune system has soybean-specific IgE antibodies, but clinical allergy depends on compatible symptoms and, when needed, additional testing.
Can I eat soybean if the result is positive?
Ask your clinician before eating soybean. If you have had a severe reaction, such as breathing difficulty, faintness, or swelling of the throat, seek emergency care and avoid unsupervised exposure.
What if the test is negative but I react after eating soybean?
A negative component-specific result does not exclude allergy caused by other soybean allergens. Your clinician may review other allergy tests, consider an alternative diagnosis, or recommend supervised food testing.
  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