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Safflower-Specific IgG by Radioallergosorbent Testing (RAST), Qualitative

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

A qualitative blood test that checks for IgG antibodies directed against safflower.

Quick summary

["Detectable IgG may reflect prior exposure to safflower but does not by itself confirm a clinical allergy."]

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

Key facts at a glance

LOINC
21506-1
Short code
Deprecated Safflower IgG RAST Ql
Synonyms
Deprecated Safflower 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 qualitative test looks for safflower-specific IgG antibodies in a blood sample. IgG is an immune-system protein that can develop after exposure to a substance.

Why might I need this test?

It may be considered when a person has symptoms or a suspected reaction associated with eating safflower or safflower-containing products. Results are reviewed alongside symptoms, exposure history, and other allergy testing.

How is the test performed?

A blood sample is analyzed in the laboratory to determine whether safflower-specific IgG is detectable. Because the result is qualitative, it generally reports presence or absence rather than a measured antibody concentration.

How do I prepare for the test?

No special preparation is usually required, including fasting, unless the laboratory provides different instructions. Tell the healthcare provider about recent safflower exposure, symptoms, medications, and any known allergies.

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.

A detectable result indicates that safflower-specific IgG antibodies are present, which may reflect previous exposure or an immune response. IgG results alone do not establish an IgE-mediated allergy or explain symptoms, so they must be interpreted with the clinical history and other appropriate testing.

Short name

Safflower-Specific IgG

Frequently asked questions

Does a positive result mean I am allergic to safflower?
Not necessarily. Safflower-specific IgG can occur after exposure without causing allergy, so a positive result should not be used alone to diagnose a clinical allergy.
How is this result different from a safflower-specific IgE test?
IgG generally reflects exposure or immune recognition, while IgE is more closely associated with immediate allergic reactions. Your clinician can determine which testing is most useful for your symptoms.
Why was this test designation deprecated?
The test may have been retired or replaced because of limited clinical usefulness or changes in laboratory testing standards. Ask the ordering clinician whether a current allergy test would be more 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