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Spinach-Specific IgG Antibody, Radioallergosorbent Test (RAST), Qualitative (Deprecated)

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

A historical blood test that looked for spinach-specific IgG antibodies. It is deprecated and does not reliably diagnose spinach allergy.

Quick summary

["This deprecated test cannot confirm a spinach allergy, so current allergy evaluation should guide any food restrictions."]

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

Key facts at a glance

LOINC
21537-6
Short code
Deprecated Spinach IgG RAST Ql
Synonyms
Deprecated Spinach 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 is a qualitative RAST-style blood test that detects antibodies directed against spinach. It has been marked as deprecated and is not routinely recommended for evaluating food allergy.

Why might I need this test?

It may appear in older records or have been ordered to investigate a suspected food reaction. Because spinach-specific IgG can occur without a true allergy, results should be reviewed with an allergy professional.

How is the test performed?

If performed, the laboratory tests a blood sample for spinach-specific IgG and reports the result qualitatively, generally as detectable or not detectable. The test does not directly measure the immediate allergic reaction that occurs with food allergy.

How do I prepare for the test?

No special preparation is usually required for this type of blood test. Follow the instructions provided by the ordering clinician or laboratory, particularly if you have a history of severe allergic reactions.

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

Spinach IgG antibody test

Frequently asked questions

Does a positive result mean I am allergic to spinach?
No. This test detects IgG antibodies, which may occur without a true allergy. Your clinician should interpret the result in the context of symptoms and other appropriate evaluation.
Why is this test called deprecated?
Deprecated means the test is no longer routinely recommended or may have been replaced. A current allergy evaluation is generally more useful for suspected food allergy.
Should I stop eating spinach based on this result?
Do not change your diet solely because of this test. Discuss the result with your clinician or allergist, especially if you have eaten spinach without symptoms or have never reacted to it.
  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