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Cultivated Rye Allergen-Specific IgE, Qualitative (Deprecated)

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

This test detects IgE antibodies directed against cultivated rye, which may indicate sensitization to rye. Results must be interpreted with symptoms and exposure history.

Quick summary

["A positive result suggests the immune system is sensitized to rye 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
15997-0
Short code
Deprecated Cultivated Rye IgE RAST Ql
Synonyms
Deprecated Cultivated Rye 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 laboratory test looks for allergen-specific IgE antibodies to cultivated rye. IgE is an immune-system protein that can be produced in response to an allergen.

Why might I need this test?

It may be ordered when a person has symptoms after eating rye or products containing rye. It can also be used as part of an evaluation for suspected food allergy.

How is the test performed?

A blood sample is tested in the laboratory for antibodies that recognize rye allergens. The result is reported as positive or negative under the qualitative designation used for this test.

How do I prepare for the test?

No special food or fasting preparation is usually required. Tell your clinician about any antihistamine or other allergy medicines you take, and do not stop prescribed medicines unless instructed.

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

Cultivated rye IgE

Frequently asked questions

What does a positive cultivated rye IgE result mean?
It means the immune system has produced IgE antibodies that recognize rye allergens. This suggests sensitization, but your clinician must consider your symptoms, exposures, and other test findings before diagnosing an allergy.
Does a positive result mean I will react to rye?
Not necessarily. Some people have rye-specific IgE without symptoms, while others react only when eating a sufficient amount or in certain circumstances.
Why is this test marked as deprecated?
The deprecated designation indicates that this particular test entry is no longer preferred or may have been replaced in the laboratory's testing catalog. Ask the ordering clinician about the currently available alternative and how its results should be interpreted.
  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