Swine Urinary Protein-Specific IgE, Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to swine urinary proteins, which may occur in animal-care settings or after exposure to pigs.
["A positive result suggests an allergic immune response to swine urinary protein but must be interpreted alongside symptoms and exposure history."]
Key facts at a glance
- LOINC
- 102619-4
- Short code
- Swine Urine Prot IgE RAST
- Synonyms
- Swine Urine Prot IgE RAST
- Category
- urine
- 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
- Method
- rast
- 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 measures IgE antibodies directed against proteins found in swine urine. These proteins may become airborne in environments where pigs are handled, such as farms, barns, or veterinary facilities.
Why might I need this test?
The test may be ordered if you develop sneezing, wheezing, hives, swelling, or other allergic symptoms after contact with pigs, swine housing, or swine-related dust.
How is the test performed?
A blood sample is collected, and the serum is tested in the laboratory for IgE antibodies to swine urinary protein using a radioallergosorbent-type method. Results are reported as positive or negative, with a measurement when provided.
How do I prepare for the test?
No special preparation is usually required. Tell your clinician about recent exposure to pigs or swine products and about any allergy symptoms, as these details help interpret the result.
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 your immune system has produced IgE antibodies to swine urinary protein, suggesting allergic sensitization. It does not by itself confirm a symptomatic allergy, because exposure and medical history must also be considered. A negative result makes this particular sensitization less likely but does not rule out reactions to other swine proteins or allergens.
Short name
Swine Protein IgE (RAST)
Frequently asked questions
Does a positive result mean I am allergic to pork?
Can this test explain symptoms after working with pigs?
Should I stop allergy medicines before the 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