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Peanut Ara h 6-Specific IgE, Qualitative (RAST) — Deprecated

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

A blood test for IgE antibodies to the peanut protein Ara h 6. This older RAST-based test entry is deprecated and may not be available.

Quick summary

["A detectable result can indicate an immune sensitization to the peanut protein Ara h 6."]

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

Key facts at a glance

LOINC
87718-3
Short code
Deprecated Peanut (rAra h) 6 IgE RAST Ql
Synonyms
Deprecated Peanut (rAra h) 6 IgE 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 Ara h 6-specific IgE antibodies in blood. Ara h 6 is a peanut protein, and IgE is the antibody involved in allergic reactions. This test entry is deprecated, so it may no longer be offered by laboratories.

Why might I need this test?

It may have been used to help evaluate a suspected peanut allergy or identify sensitization to a specific peanut protein. Results are considered alongside symptoms, other allergy tests, and your medical history.

How is the test performed?

A blood sample is tested for IgE directed against Ara h 6. This older RAST-based method reports whether the antibody is detected or not detected; it does not measure the amount of peanut in the body.

How do I prepare for the test?

Fasting is generally not required. Continue your usual diet unless your clinician gives different instructions, and tell the laboratory if you have recently taken antihistamine medicines, as they may affect the results.

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

Peanut Ara h 6 IgE

Frequently asked questions

Does a positive result mean I will have a severe peanut reaction?
No. It shows that Ara h 6-specific IgE is present, but it cannot by itself determine the severity or timing of a possible reaction.
Should I avoid eating peanuts before this test?
Usually, do not change your diet solely for this test unless your clinician instructs you to. Eating or avoiding peanut can affect allergy-test results, so discuss any planned changes with your clinician.
Why is this test listed as deprecated?
The older RAST-based test entry is no longer considered current, so many laboratories use other component-specific IgE methods instead. Ask your healthcare provider about the currently available alternative.
  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