Nutmeg-Specific Immunoglobulin G (IgG) Antibody, Qualitative (RAST) — Deprecated
A qualitative blood test that detects IgG antibodies to nutmeg. This legacy RAST test does not by itself confirm a clinical nutmeg allergy.
["A positive result shows a nutmeg-specific IgG response, but it does not prove that nutmeg causes allergic symptoms."]
Key facts at a glance
- LOINC
- 21425-4
- Short code
- Deprecated Nutmeg IgG RAST Ql
- Synonyms
- Deprecated Nutmeg 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 test looks for IgG antibodies directed against nutmeg in a blood sample. RAST stands for radioallergosorbent test, an older laboratory method for measuring allergen-specific antibodies. This test is considered deprecated and may not be available through all laboratories.
Why might I need this test?
It may have been ordered to evaluate a suspected food-related reaction to nutmeg or to document an immune response after exposure. Because IgG results can occur without true allergy, a clinician must interpret them alongside symptoms and medical history.
How is the test performed?
A blood sample is exposed to nutmeg allergen in the laboratory, and any attached IgG antibodies are detected. The result is reported qualitatively, generally as positive or negative.
How do I prepare for the test?
No special preparation is usually required for a routine antibody blood test. Follow the laboratory's instructions, and tell the ordering clinician about any food reactions, recent exposures, or medicines that could affect interpretation.
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.
A positive result indicates that nutmeg-specific IgG antibodies are present, which can reflect prior exposure or sensitization. It does not establish that nutmeg is the cause of symptoms or predict the severity of a reaction. A negative result does not completely rule out an immune response or allergy.
Short name
Nutmeg-specific IgG (RAST)
Frequently asked questions
Does a positive nutmeg IgG result mean I am allergic to nutmeg?
What symptoms may suggest a nutmeg allergy?
Why is this test listed as deprecated?
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