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Desert ragweed-specific immunoglobulin E (IgE) by immunoassay

Published: August 9, 2026Updated: August 16, 2026

This test measures the level of a specific antibody (IgE) your body produces in response to exposure to desert ragweed pollen. IgE is linked to allergic reactions.

Quick summary

["This test helps assess potential allergies to desert ragweed pollen."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
7647-1
Short code
Desert Ragweed IgE Qn
Synonyms
Desert Ragweed IgE Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
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 Does This Test Measure?

IgE antibodies are part of your immune system’s response to allergens. When your body encounters an allergen like pollen, it may produce IgE to try to protect you. This test specifically looks for IgE directed against desert ragweed, a type of pollen found in certain regions.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like sneezing, itching, or a runny nose that occur during certain seasons or in specific environments. It can help determine if your symptoms are linked to ragweed pollen exposure.

How Is the Test Performed?

A blood sample is taken from your arm. The blood is then processed and analyzed to detect the presence and amount of IgE antibodies specific to desert ragweed. This process typically involves a laboratory immunoassay method.

What Are Common Symptoms?

Allergic reactions to ragweed pollen can cause symptoms such as itchy or watery eyes, sneezing, a runny or stuffy nose, itchy throat, or skin rashes. Some people may also experience more severe reactions like difficulty breathing or swelling.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test helps identify if you have an allergic reaction to desert ragweed pollen, which can guide treatment plans such as avoiding exposure or using allergy medications. Elevated IgE levels may indicate a heightened immune response that requires medical attention.

Short name

IgE to Desert Ragweed

Frequently asked questions

What does a positive result mean?
A positive result suggests that your body has produced IgE antibodies against desert ragweed pollen. This may mean you are allergic to it, but it does not confirm the severity of your allergy or how it will affect you personally. Further evaluation by an allergist may be needed to confirm and manage symptoms.
How long does it take to get results?
Results from this test are usually available within a few days to a couple of weeks, depending on the laboratory’s processing time. Your healthcare provider will discuss the results with you during your follow-up appointment.
Can I take anything before the test?
No special preparations are needed for this blood test. However, always follow your healthcare provider’s instructions, as they may vary based on individual circumstances.
  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 16, 2026. · Read our editorial policy