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Desert Ragweed-Specific Immunoglobulin E (IgE) by Immunoassay

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

This test measures the level of Immunoglobulin E (IgE), a type of antibody your body produces in response to allergens like pollen from desert ragweed. It helps determine if you may have an allergic reaction to this specific pollen.

Quick summary

["IgE testing helps identify potential allergies to desert ragweed pollen, guiding allergy management and treatment options."]

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

Key facts at a glance

LOINC
102557-6
Short code
Desert Ragweed IgE RAST
Synonyms
Desert Ragweed IgE RAST
Category
chemistry
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
rast
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 This Test Measures

IgE is a protein produced by your immune system in response to allergens. When your body detects an allergen like desert ragweed pollen, it may produce higher levels of IgE. This test specifically looks for IgE antibodies directed against desert ragweed pollen.

Why It’s Done

Your healthcare provider may order this test if you suspect an allergy to desert ragweed pollen, especially if you experience symptoms like sneezing, itching, or respiratory issues during certain seasons.

How the Test Works

A small blood sample is taken to detect the presence and amount of IgE antibodies specific to desert ragweed pollen. The sample is analyzed using an immunoassay method to measure these antibodies.

What to Expect Before the Test

No special preparation is needed for this test. You may have a simple blood draw, usually done at a clinic or lab. If you’re taking blood at home, follow the instructions provided with your test kit carefully.

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

IgE to Desert Ragweed

Frequently asked questions

What does a high or low IgE level mean?
A high IgE level specific to desert ragweed suggests an allergic reaction to the pollen. This can help your healthcare provider determine if you need further allergy testing or treatment options, such as avoiding exposure or allergy medications.
How long does it take to get results?
Results are typically available within a few days to a week, depending on the lab’s processing time. Your healthcare provider will discuss the results with you during your follow-up visit.
Can I take anything before the blood draw?
No special preparations are needed. However, if you’re taking blood at home, follow the instructions provided with your kit carefully to ensure accurate results.
  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