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Serum or plasma substance concentration (qualitative) for walnut-related juice protein (e.g., potential allergen)

Published: August 9, 2026Updated: August 16, 2026

This test measures a specific protein found in walnut juice, which may be relevant for allergy screening or research purposes. Results are qualitative, meaning they indicate presence or absence rather than precise amounts.

Quick summary

["This test helps assess potential exposure to walnut juice proteins, useful in allergy studies or specialized diagnostic contexts."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
81789-0
Short code
English walnut (rJug r) 3 IgE Qn
Synonyms
English walnut (rJug r) 3 IgE Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 This Test Measures

The test detects the presence of a protein derived from walnut juice, often used in research or specialized allergy testing. This protein may trigger allergic reactions in sensitive individuals.

Why It Might Be Ordered

Your healthcare provider may order this test if you are suspected of having an allergy to walnut juice, participating in a clinical study, or if research requires monitoring specific protein exposure.

Sample Collection and Preparation

Blood is drawn from a vein in your arm. The sample is processed into either serum (liquid after clotting) or plasma (liquid after centrifugation), then analyzed for the walnut juice protein.

Test Results Interpretation

Results are qualitative: a positive result indicates the presence of the walnut juice protein in your sample, while a negative result means it is not detected. Interpretation depends on clinical context and provider guidance.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Frequently asked questions

This test is not routinely used for general health monitoring but may play a role in allergy research, specialized diagnostic procedures, or controlled exposure studies.
This test is primarily for research or allergy-specific purposes and does not provide information about general health conditions like diabetes or thyroid function.
How long will I need to fast before this test?
Fasting requirements may vary depending on the clinical context. Your healthcare provider will specify instructions, but typically, no fasting is required for qualitative protein testing.
What are the potential side effects of blood drawing?
Common side effects include mild bruising, soreness, or swelling at the injection site. Rarely, fainting or excessive bleeding may occur. Inform your provider if you experience unusual symptoms.
  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 16, 2026. · Read our editorial policy