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Cucumber IgG Antibody, Qualitative (RAST)

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

A qualitative blood test that detects IgG antibodies directed against cucumber, indicating prior immune exposure.

Quick summary

["A positive result shows exposure to cucumber but does not by itself diagnose a food allergy."]

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

Key facts at a glance

LOINC
21234-0
Short code
Deprecated Cucumber IgG RAST Ql
Synonyms
Deprecated Cucumber 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 legacy blood test, also called a cucumber IgG radioallergosorbent test (RAST), looks for IgG antibodies to cucumber. IgG is part of the immune system and may develop after exposure to a food.

Why might I need this test?

It may be ordered to assess immune exposure to cucumber, often as part of an evaluation of suspected food-related symptoms. Because IgG antibodies can occur without a true allergy, this result should be interpreted alongside symptoms and other allergy testing.

How is the test performed?

A blood sample is tested for antibodies that bind to cucumber allergens. The RAST method reports the result qualitatively, generally as positive or negative.

How do I prepare for the test?

No special preparation is usually required for a routine antibody blood test. Follow any instructions provided by the laboratory or healthcare professional, and tell them if you have recently eaten cucumber or started a new medication.

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

Cucumber IgG RAST

Frequently asked questions

Does a positive cucumber IgG test mean I am allergic to cucumber?
No. Food-specific IgG antibodies can be present in people without a food allergy, so a positive result alone does not diagnose allergy or predict a reaction.
What symptoms may be related to a cucumber allergy?
Possible reactions can include hives, swelling, itching, vomiting, abdominal pain, or breathing difficulty. A clinician should assess symptoms that occur shortly after eating cucumber.
What should I do if I have a severe reaction to cucumber?
Seek emergency care for trouble breathing, throat swelling, faintness, or a rapidly developing reaction. Use prescribed emergency medication if available and tell emergency responders about the suspected cucumber allergy.
  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