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Zucchini-Specific IgG Radioallergosorbent (RAST) Test, Qualitative — Deprecated

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

A qualitative blood test that looks for antibodies to zucchini. This legacy test is not the usual method for diagnosing food allergy.

Quick summary

["Detectable zucchini-specific IgG generally indicates prior exposure but does not by itself confirm a food allergy."]

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

Key facts at a glance

LOINC
21541-8
Short code
Deprecated Zucchini IgG RAST Ql
Synonyms
Deprecated Zucchini 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 examines a blood sample for IgG antibodies directed against zucchini. A qualitative result reports whether zucchini-specific IgG was detected. The test is marked as deprecated, so it may no longer be routinely available.

Why might I need this test?

It may have been used to evaluate an immune response after eating zucchini or as part of an evaluation for suspected food sensitivity. Because this is a legacy test, a clinician may instead recommend current allergy testing when appropriate.

How is the test performed?

A blood sample is tested using a RAST-style method that detects antibodies binding to zucchini-derived material. The laboratory provides a qualitative result, such as detected or not detected, rather than a quantitative measurement.

How do I prepare for the test?

No special preparation is usually required for this blood test. Follow the laboratory's instructions and tell the healthcare provider if you have recently eaten zucchini or have other food-related symptoms.

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

Zucchini IgG test

Frequently asked questions

Does a positive result mean I am allergic to zucchini?
No. Detectable zucchini-specific IgG can occur after previous exposure and is not sufficient to diagnose a clinical food allergy.
What should I do if I have symptoms after eating zucchini?
Discuss the timing and type of your symptoms with a clinician. An allergist may recommend skin-prick testing or zucchini-specific IgE testing rather than this deprecated IgG test.
Why is this test described as deprecated?
The designation means the test is an older or retired assay and may not be available or routinely recommended. Contact the ordering laboratory to confirm availability before having the test performed.
  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