White Mulberry-Specific IgG, Radioallergosorbent (RAST) Test — Qualitative (Deprecated)
A deprecated qualitative test that detects IgG antibodies directed against white mulberry proteins; results do not by themselves confirm allergy.
["A positive result shows prior immune exposure to white mulberry, but it does not establish a clinically significant allergy."]
Key facts at a glance
- LOINC
- 58008-4
- Short code
- Deprecated White mulberry IgG RAST Ql
- Synonyms
- Deprecated White mulberry 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 laboratory test looks for IgG antibodies to proteins from the white mulberry plant. The test is listed as deprecated and is not commonly used in current allergy practice.
Why might I need this test?
It may have been used to evaluate immune exposure to white mulberry, a plant pollen that can cause seasonal allergy symptoms. Testing is generally considered when symptoms suggest an environmental allergy and the cause is unclear.
How is the test performed?
A laboratory sample is tested with a radioallergosorbent method to determine whether white mulberry-specific IgG is present. The result is reported qualitatively rather than with a measured concentration.
How do I prepare for the test?
No special preparation is usually needed for this type of antibody test. Follow the laboratory's instructions and tell the care team about any immunosuppressive medicines or major illnesses that could affect antibody results.
Reference range
Adult: 10-40 U/LN/A
No special preparation required. Avoid fatty meals before the test if possible.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Detectable white mulberry-specific IgG indicates that the immune system has encountered white mulberry proteins. IgG can reflect exposure or a nonallergic immune response and is not proof of an IgE-mediated allergy. A negative result does not exclude allergy, so results should be interpreted alongside symptoms, exposure history, and any more appropriate allergy testing.
Short name
White Mulberry IgG RAST
Frequently asked questions
Does a positive result mean I am allergic to white mulberry?
Why is this test called deprecated?
What is the difference between IgG and IgE?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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