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

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

A legacy blood test that looked for apricot-specific IgG antibodies. It is not routinely used and does not reliably diagnose food allergy.

Quick summary

["Detectable apricot-specific IgG usually indicates exposure or sensitization, not necessarily a true apricot allergy."]

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

Key facts at a glance

LOINC
21073-2
Short code
Deprecated Apricot IgG RAST Ql
Synonyms
Deprecated Apricot 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 deprecated test looked for IgG antibodies directed against apricot proteins in a blood sample. IgG antibodies are part of the immune system’s response to a food.

Why might I need this test?

It was historically used to evaluate suspected food sensitivities. Because food-specific IgG results do not reliably identify clinical allergies, this test is no longer routinely recommended for diagnosing food allergy.

How is the test performed?

A serum sample is tested with apricot allergen using a radioallergosorbent-type laboratory method. The result is reported as detectable or not detectable.

How do I prepare for the test?

No special preparation is usually required. Follow the laboratory’s instructions, and tell your clinician about any symptoms you experience after eating apricots.

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

Apricot IgG RAST

Frequently asked questions

Does a positive result mean I am allergic to apricots?
No. Food-specific IgG can occur in people who tolerate a food normally, so a positive result alone does not establish a clinical allergy.
How is this test different from apricot-specific IgE testing?
IgG testing measures one type of immune response, while IgE testing can be more relevant when a true, immediate food allergy is suspected. Your clinician can recommend an appropriate evaluation.
Why is this test marked as deprecated?
It is no longer routinely used because IgG results correlate poorly with symptomatic food allergy and can be misleading. Current allergy evaluation emphasizes the medical history and appropriately selected IgE or other 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