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

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

A qualitative test for IgG antibodies directed against almond proteins. This older RAST-based test does not by itself diagnose almond allergy.

Quick summary

["Detectable almond-specific IgG may indicate prior exposure but does not confirm an immediate almond allergy."]

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

Key facts at a glance

LOINC
21063-3
Short code
Deprecated Almond IgG RAST Ql
Synonyms
Deprecated Almond 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 looks for IgG antibodies that recognize almond proteins. RAST is an older laboratory method, and this test is marked as deprecated, so it may no longer be routinely offered.

Why might I need this test?

It may have been ordered to evaluate a possible food-related reaction or previous exposure to almonds. Because food-specific IgG can occur without allergy, the result must be considered with symptoms and other allergy evaluation methods.

How is the test performed?

A laboratory sample is examined for antibodies that bind to almond proteins. Because the test is qualitative, the result generally indicates whether almond-specific IgG was detected rather than providing a specific concentration.

How do I prepare for the test?

No special preparation is commonly required for this test. Follow any instructions from the ordering clinician, and tell the laboratory about medicines, supplements, or recent changes in your diet that could affect the interpretation.

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

Almond-specific IgG antibody test

Frequently asked questions

Does a positive result mean I am allergic to almonds?
No. Almond-specific IgG can be present in people who tolerate almonds, so a positive result alone does not establish allergy. Your clinician will interpret it together with your symptoms and other test findings.
Why is this test marked as deprecated?
The test is based on an older RAST method and may have been replaced or discontinued. Ask the ordering clinician whether a more current food-allergy evaluation is appropriate.
What should I do if I have eaten almonds and had a reaction?
Seek urgent medical care for trouble breathing, throat swelling, faintness, or a rapidly developing widespread reaction. For non-emergency symptoms, arrange an allergy evaluation rather than relying on this IgG test.
  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