Shagbark Hickory-Specific IgE (RAST), Qualitative
A qualitative blood test that detects IgE antibodies to shagbark hickory, helping assess sensitization to this tree nut.
["A positive result indicates an immune response to shagbark hickory but does not by itself confirm a clinical allergy."]
Key facts at a glance
- LOINC
- 21329-8
- Short code
- Deprecated Shagbark Hickory IgE RAST Ql
- Synonyms
- Deprecated Shagbark Hickory IgE RAST Ql
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Ref low
- 10
- Ref high
- 40
- Critical range
- — – 10000 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 allergen-specific IgE antibodies directed against shagbark hickory, a tree nut. It is sometimes called a RAST test, although current laboratory methods may use other immunoassay technology.
Why might I need this test?
It may be ordered if you have eaten shagbark hickory or another tree nut and developed symptoms such as hives, swelling, wheezing, vomiting, or abdominal pain. Your clinician will interpret the result along with your exposure history and symptoms.
How is the test performed?
A laboratory analyzes a blood sample for IgE antibodies to shagbark hickory. This qualitative result is generally reported as positive or negative, although some laboratories may also provide a measurement level.
How do I prepare for the test?
No fasting or special preparation is usually required. Do not intentionally eat shagbark hickory before testing, and follow any additional instructions provided by the ordering clinician or laboratory.
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 sensitization to shagbark hickory, meaning the immune system has produced IgE antibodies to it. This may represent a true tree-nut allergy, but cross-reactivity with related allergens is also possible. A negative result reduces the likelihood of IgE-mediated allergy but does not completely exclude it.
Short name
Shagbark hickory IgE
Frequently asked questions
Does a positive result mean I will have an allergic reaction?
Can I eat shagbark hickory if the result is positive?
Why was this test sometimes labeled 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