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Weed Allergen Mix 1 IgE Antibody, Serum — Radioallergosorbent Test (RAST)

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

A blood test that measures IgE antibodies to a mixture of weed allergens, helping evaluate possible allergic sensitization.

Quick summary

["Detecting weed-specific IgE supports possible weed allergy, but symptoms and other allergy tests are needed for diagnosis."]

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

Key facts at a glance

LOINC
24481-4
Short code
Weed Allerg Mix1 IgE RAST
Synonyms
Weed 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 blood test measures IgE antibodies directed against a mixture of allergens from common weeds. It is used to help identify whether weed pollen or other weed allergens may trigger an allergic reaction.

Why might I need this test?

You may need this test if you have sneezing, congestion, itchy or watery eyes, wheezing, or hives during certain seasons or after exposure to weeds. The results can help guide evaluation, allergy management, and possible immunotherapy.

How is the test performed?

A blood sample is collected and tested in the laboratory for allergen-specific IgE using a radioallergosorbent-type method. The report may provide a qualitative result or a measured antibody level.

How do I prepare for the test?

Fasting is usually not required. Tell your clinician about any antihistamine or other allergy medicines you take, and do not stop prescribed medication unless your clinician instructs you to do so.

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

Weed Allergen Mix 1 IgE

Frequently asked questions

Does a positive result mean I am allergic to weeds?
It indicates that your immune system has produced IgE antibodies to at least one allergen in the weed mixture. Your clinician will interpret this alongside your symptoms, exposure history, and other allergy tests.
What symptoms can weed allergy cause?
Common symptoms include sneezing, runny or blocked nose, itchy or watery eyes, coughing, wheezing, and hives. Severe reactions are possible but cannot be predicted from this test alone.
Can I stop allergy medicine before this test?
Do not stop medication without guidance from your clinician. Antihistamines and some other treatments can affect allergy testing, so your clinician should tell you whether any medication should be held and for how long.
  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