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Swine Serum Albumin-Specific IgE, Serum — RAST, Qualitative

Published: August 9, 2026Updated: August 17, 2026

A legacy allergy blood test that checks for IgE antibodies to swine serum albumin, a protein associated with pork exposure.

Quick summary

["A positive result suggests an immune sensitization to swine serum albumin, but it must be interpreted alongside symptoms and medical history."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 17, 2026Editorial policy

Key facts at a glance

LOINC
25532-3
Short code
Deprecated Swine Serum Alb IgE RAST Ql
Synonyms
Deprecated Swine Serum Alb 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 qualitative blood test looks for IgE antibodies directed against swine serum albumin. It is a deprecated, legacy allergy test and may be replaced by newer testing for specific pork-allergen components.

Why might I need this test?

It may have been ordered to investigate a suspected pork allergy or reactions after eating pork. It can also help assess sensitization to animal proteins, although the result alone does not confirm a clinical allergy.

How is the test performed?

A blood sample is collected and separated to obtain serum. The laboratory uses an allergy immunoassay, historically described as a RAST, to report whether antibodies to swine serum albumin are detected.

How do I prepare for the test?

No special preparation or fasting is usually required. Tell your clinician about all food allergies, recent reactions, and any immunosuppressive medicines because these factors may affect interpretation.

Reference range

Adult: 10-40 U/LN/A

Specimen: serum

No special preparation required. Avoid fatty meals before the test if possible.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Swine serum albumin IgE

Frequently asked questions

What does a positive result mean?
It means IgE antibodies to swine serum albumin were detected, suggesting sensitization. Your clinician will determine whether this finding matches your symptoms and represents a true clinical allergy.
Does a negative result rule out pork allergy?
No. A negative result makes this particular sensitization less likely, but it cannot exclude an allergy to other pork proteins or a non-IgE-mediated reaction.
Is this test still commonly used?
It is a deprecated test. Newer component-based allergy testing may provide more specific information when pork allergy is suspected.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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