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Peanut rAra h 9-Specific IgE Antibody — RAST, Qualitative

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

A qualitative blood test that detects IgE antibodies against rAra h 9, a peanut storage protein, indicating sensitization to that peanut component.

Quick summary

["A positive result shows sensitization to the peanut protein rAra h 9 but does not, by itself, confirm a clinical peanut allergy."]

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

Key facts at a glance

LOINC
81994-6
Short code
Deprecated Peanut (rAra h) 9 IgE RAST Ql
Synonyms
Deprecated Peanut (rAra h) 9 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 measures your immune system's response to rAra h 9, a storage protein found in peanuts. It is performed using RAST, a laboratory method that detects peanut-specific IgE antibodies in a blood sample.

Why might I need this test?

A clinician may order this test when you have a history of suspected peanut allergy or reactions to other foods. It can help identify whether your immune system reacts to this particular peanut protein.

How is the test performed?

A blood sample is collected and the laboratory uses a RAST method to look for IgE antibodies directed against rAra h 9. The result is reported qualitatively as positive or negative.

How do I prepare for the test?

No special preparation is usually required, and fasting is generally unnecessary. Follow any instructions from the ordering clinician and do not stop prescribed medicines without medical advice.

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 Component IgE (RAST)

Frequently asked questions

Does a positive result mean I am allergic to peanuts?
A positive result shows sensitization to rAra h 9, but it must be interpreted with your symptoms, exposure history, and other tests. Your clinician can explain how strongly this finding supports a peanut allergy.
Is this the same as a peanut skin-prick test?
No. This test detects peanut-specific IgE in blood, while a skin-prick test evaluates a skin reaction after a small amount of allergen is placed on the skin. Both should be interpreted in a clinical context.
Should I avoid peanuts based on this result?
Do not change your diet or confirm an allergy based only on this laboratory result. Discuss the finding with your clinician, especially if you have previously had a reaction to peanuts.
  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