Horse Hair Dander-Specific IgE, Qualitative (RAST Test)
Detects IgE antibodies directed against horse hair dander to help evaluate a possible horse allergy.
["A positive result suggests allergic sensitization to horse dander but must be interpreted with allergy symptoms and exposure history."]
Key facts at a glance
- LOINC
- 44379-6
- Short code
- Deprecated Horse Hair+Dander IgE RAST Ql
- Synonyms
- Deprecated Horse Hair+Dander 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 blood test looks for allergen-specific IgE antibodies against horse hair and dander. It is sometimes called a RAST test, although many laboratories use other immunoassay methods.
Why might I need this test?
The test may be ordered if you develop sneezing, nasal congestion, cough, wheezing, hives, or other symptoms after contact with horses, horse hair, or stable environments.
How is the test performed?
A blood sample is collected and tested in the laboratory for antibodies that recognize horse dander. The result is reported as positive, negative, or possibly indeterminate, depending on the laboratory.
How do I prepare for the test?
No special preparation is usually required, and fasting is generally unnecessary. Tell your clinician about recent horse exposure, allergy symptoms, medicines, and any prior allergy testing.
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 the immune system has developed IgE antibodies to horse dander, which is consistent with sensitization. It does not by itself prove that horse exposure causes the person's symptoms, so results should be interpreted with the clinical history and, when appropriate, other allergy testing. A negative result may make horse allergy less likely but does not completely exclude it.
Short name
Horse dander IgE (RAST)
Frequently asked questions
Does a positive result mean I am allergic to horses?
Can I have this test if I have no symptoms?
What is the difference between IgE blood testing and a skin-prick test?
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