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Epidermal Allergen Mix 1–Specific IgE, Serum (RAST)

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

A blood test that measures IgE antibodies to a mixture of common airborne allergens, helping assess possible allergic sensitization.

Quick summary

["A positive result suggests an allergic response to one or more tested airborne allergens but must be interpreted with symptoms and exposure history."]

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

Key facts at a glance

LOINC
24483-0
Short code
Epid Allerg Mix1 IgE RAST
Synonyms
Epid Allerg Mix1 IgE RAST
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
Method
multidisk
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 allergen-specific IgE antibodies in a blood sample against a mixture of common airborne allergens, such as dust mites and animal dander. It is sometimes called a RAST test.

Why might I need this test?

It may be used to help identify possible triggers of sneezing, wheezing, hives, or other allergy symptoms. Your clinician will compare the results with your symptoms, environment, and medical history.

How is the test performed?

A blood sample is collected and tested for IgE antibodies to the allergens in the mixture. The laboratory reports which tested allergens show measurable sensitization, often using a qualitative or graded result.

How do I prepare for the test?

Fasting is generally not required. Antihistamines and some other allergy medicines may affect results; tell your clinician about all medicines and supplements, and do not stop prescribed treatment without guidance.

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

Epidermal Allergen Mix 1 IgE

Frequently asked questions

Does a positive result mean I am allergic?
It suggests possible IgE-mediated sensitization to a tested allergen. Your clinician must interpret it in light of your symptoms because sensitization can occur without a clinically important allergy.
Can this test determine the severity of my allergy?
No. The result can help identify likely triggers, but symptom frequency, severity, and other findings are needed to assess the clinical impact.
Should I stop taking allergy medicine before the test?
Ask your clinician before stopping antihistamines or other allergy treatments, because some medicines can affect the results. Follow the instructions provided for your specific situation.
  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