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

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

A qualitative test that detects potato-specific IgG antibodies in a blood sample. This deprecated test does not by itself diagnose a true food allergy.

Quick summary

["A positive result shows potato-specific IgG antibodies, but it does not confirm that eating potatoes causes an allergic reaction."]

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

Key facts at a glance

LOINC
21479-1
Short code
Deprecated Potato IgG RAST Ql
Synonyms
Deprecated Potato 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 directed against potato proteins and reports the result as positive or negative. IgG is an immune-system protein that can develop after exposure to a food.

Why might I need this test?

It may have been used to evaluate a suspected food-related reaction or to assess immune response to potatoes. Because food-specific IgG testing is not a reliable indicator of true allergy, results should be interpreted with a clinician.

How is the test performed?

A laboratory sample is tested for antibodies that bind to potato proteins. The RAST method is commonly associated with allergen-antibody testing, and this version reports only whether detectable antibodies are present.

How do I prepare for the test?

Follow the laboratory's instructions for sample collection, timing, and any food-exposure history it requests. Do not deliberately avoid potatoes or other foods before testing unless your clinician instructs you to do so.

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

Potato-Specific IgG Test

Frequently asked questions

Does a positive result mean I am allergic to potatoes?
No. Potato-specific IgG antibodies may occur after normal exposure and do not confirm a true food allergy. Your clinician should interpret the result alongside your symptoms and medical history.
What symptoms might prompt this test?
It may be considered when symptoms such as hives, swelling, abdominal discomfort, or other reactions occur after eating potatoes. Testing may also be included in broader food-antibody panels.
Why is this test marked as deprecated?
Food-specific IgG tests are generally not recommended for diagnosing food allergy because they can produce results that do not reflect clinically meaningful allergy. Current evaluation is more often guided by symptoms, medical history, and targeted IgE testing when appropriate.
  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