Weed Allergen Mix 6-Specific IgE, Serum — Radioallergosorbent Test (RAST)
A blood test that measures IgE antibodies to a mixture of weed allergens, helping identify possible allergic sensitization.
["Detected weed-specific IgE may support a weed allergy, but results must be interpreted with symptoms and medical history."]
Key facts at a glance
- LOINC
- 82043-1
- Short code
- Weed Allerg Mix6 IgE RAST
- Synonyms
- Weed Allerg Mix6 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 blood test measures IgE antibodies directed against a panel of weed allergens. It is commonly performed using a radioallergosorbent test, or RAST, method.
Why might I need this test?
Your clinician may order it to evaluate suspected weed allergies, especially if you have sneezing, watery eyes, wheezing, or other symptoms after exposure to weeds, grass, or outdoor plants.
How is the test performed?
A blood sample is drawn and tested in a laboratory for allergen-specific IgE. The panel includes several weed allergens, so the result reflects sensitization to one or more of the included allergens rather than a specific plant.
How do I prepare for the test?
Fasting is usually not required. Tell your clinician about your symptoms, suspected exposures, allergies, and medications. Antihistamines may reduce test results, but you should stop them only if your clinician instructs you to do so.
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 IgE to the weed allergen mix suggests an immune sensitization to one or more weeds in the panel. When compatible with the medical history and examination, this may support a weed allergy; an undetectable result makes sensitization less likely. IgE results do not identify the exact triggering plant or predict symptom severity by themselves.
Short name
Weed Allergen Mix 6 IgE
Frequently asked questions
Does a positive result mean I am allergic to weeds?
Can this test tell me exactly which weed causes my symptoms?
Do I need to avoid outdoor plants if the result is positive?
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