Weed Allergen Mix 3 IgE — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to the weed allergens included in allergen mix 3, helping evaluate possible weed-related allergy.
["A positive result suggests an immune sensitization to one or more weeds in the tested mix, but it must be interpreted with your symptoms and exposure history."]
Key facts at a glance
- LOINC
- 82040-7
- Short code
- Weed Allerg Mix3 IgE RAST
- Synonyms
- Weed Allerg Mix3 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 weed-specific IgE antibodies in a blood sample using the radioallergosorbent test method. The exact weeds included in allergen mix 3 may vary by laboratory, so the report should list the individual allergens tested.
Why might I need this test?
It may be used when you have sneezing, congestion, watery eyes, wheezing, or other symptoms associated with contact with weeds. Your clinician may use the result to help identify a possible trigger and guide allergy testing or treatment.
How is the test performed?
A blood sample is exposed to the allergens in the mix. The laboratory measures any matching IgE antibodies and reports the result for each available allergen or for the panel as a whole.
How do I prepare for the test?
This blood test usually requires little or no special preparation, and fasting is generally unnecessary. Tell your clinician about all medicines and supplements you use, and do not stop any prescribed medicine without medical advice.
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.
Detectable or elevated IgE suggests an immune response to one or more weeds included in the tested mix, but it does not by itself confirm a symptomatic allergy. If you do not have weed-related symptoms, the result may reflect sensitization without clinical disease. An undetectable result makes immediate allergy to the tested weeds less likely, although it does not exclude allergy to other weeds or allergens.
Short name
Weed Allergen Mix 3 IgE (RAST)
Frequently asked questions
Does a positive result mean I am allergic to weeds?
Which weeds are included in allergen mix 3?
Can I stop allergy medicine before this 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