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Maltose-Specific IgE — Radioallergosorbent Test (RAST)

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

A blood test that measures IgE antibodies directed against maltose, which may help evaluate a suspected allergic reaction to maltose or foods containing it.

Quick summary

["Detected maltose-specific IgE can indicate immune sensitization to maltose, but symptoms and exposure history are needed to determine clinical relevance."]

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

Key facts at a glance

LOINC
103132-7
Short code
Maltose BP IgE RAST
Synonyms
Maltose BP IgE RAST
Category
liver
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
7
Ref high
56
Critical range
— – 500 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
rast
CPT
84484
SNOMED
302773008
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 measures maltose-specific IgE antibodies in a blood sample. IgE is an immune-system protein associated with allergic reactions, and RAST is an older laboratory method used to detect allergen-specific antibodies.

Why might I need this test?

Your clinician may order it when you have symptoms such as hives, swelling, wheezing, or digestive discomfort after eating maltose or products that contain it. It may also be included in a broader allergy evaluation.

How is the test performed?

A blood sample is collected and tested for IgE antibodies that recognize maltose. The result is reported as a laboratory measurement, often together with the laboratory's interpretation range.

How do I prepare for the test?

This blood test usually does not require fasting or other special preparation. Tell your clinician about recent allergic reactions, food exposures, medical conditions, and any medicines you are taking.

Reference range

Adult males: 7-56 U/L; Adult females: 7-43 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

Maltose-Specific IgE

Frequently asked questions

Does a positive result mean I have a maltose allergy?
It indicates sensitization to maltose, but it must be compared with your symptoms and exposure history. A clinician can determine whether the finding is clinically relevant.
What symptoms can suggest maltose allergy?
Possible symptoms include hives, itching, swelling, wheezing, vomiting, abdominal pain, or other immediate allergic symptoms after exposure. Severe reactions can also affect breathing or circulation and require emergency care.
How is maltose-specific IgE different from a skin-prick test?
This test measures maltose-specific antibodies in blood, while a skin-prick test observes a immediate skin reaction after a small amount of allergen is placed on the skin. Both should be interpreted by a qualified 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