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Ragweed-specific Immunoglobulin E (IgE) by Immunoassay (serum/plasma)

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

This test measures the amount of Immunoglobulin E (IgE) antibodies your body produces in response to ragweed pollen, a common allergen.

Quick summary

["It helps identify if ragweed allergy may be triggering your symptoms."]

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

Key facts at a glance

LOINC
7651-3
Short code
Deprecated Common Ragweed IgG Qn
Synonyms
Deprecated Common Ragweed IgG Qn
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82784
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

Why This Test Is Done

Doctors may order this test if you have symptoms like sneezing, itching, or difficulty breathing after exposure to ragweed pollen. It can also help diagnose allergies or guide treatment plans for seasonal allergies.

What to Expect Before the Test

No special preparation is needed. You’ll provide a blood sample, usually drawn from your arm in a clinic or lab. The sample is sent to a lab for testing.

What the Test Results Mean

Higher-than-normal IgE levels suggest an allergic reaction to ragweed. However, elevated levels alone don’t confirm an allergy without a clinical history or other tests. Results are used alongside symptoms and other diagnostic information.

Common Symptoms Linked to Ragweed Allergy

Symptoms may include seasonal allergies like runny nose, itchy or watery eyes, sneezing, or skin rashes. Severe reactions can include difficulty breathing or swelling of the throat.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgE to Common Ragweed

Frequently asked questions

What does a positive test mean?
A positive test indicates your body may be producing IgE antibodies in response to ragweed, suggesting a possible allergy. However, a positive result alone doesn’t confirm an allergy without considering your symptoms and medical history.
Can I take allergy medication before the test?
Yes, you can take your usual allergy medications before the test. These won’t affect the test results, but they may mask symptoms. If you’re unsure, ask your doctor.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab and testing process. Your doctor will discuss the results with you.
  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