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Giant ragweed-specific Immunoglobulin E (IgE) by serum/plasma concentration

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

This test measures the level of Immunoglobulin E (IgE) antibodies specific to giant ragweed pollen in your blood. It helps identify if you may have an allergic reaction to this common allergen.

Quick summary

["This test helps determine potential ragweed allergies that may trigger seasonal allergies or other allergic responses."]

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

Key facts at a glance

LOINC
48255-4
Short code
Giant Ragweed LR-mCnc
Synonyms
Giant Ragweed LR-mCnc
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?

The test detects the presence of IgE antibodies that target giant ragweed pollen. IgE is a type of antibody your immune system produces in response to allergens. High levels may suggest an allergic reaction to ragweed, which is a common cause of seasonal allergies.

Why Might You Need This Test?

Your healthcare provider may recommend this test if you experience symptoms like sneezing, itching, runny nose, or skin reactions during ragweed season (typically late summer to fall). It can also help diagnose ragweed allergy in people with other allergy symptoms or asthma.

What to Expect Before the Test

No special preparation is needed. You may have a simple blood draw from a vein in your arm. If you are on blood-thinning medication, let your healthcare provider know before the test.

What to Expect During the Test

The test involves drawing a small amount of blood from your arm. You may feel a slight pinch, but it usually takes only a few minutes. The blood sample is then sent to a lab for analysis.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Giant Ragweed IgE

Frequently asked questions

What does a high or low result mean?
A high level of giant ragweed-specific IgE suggests a possible allergy to ragweed pollen. However, results alone do not confirm an allergy; symptoms and medical history are also considered. Low levels do not necessarily mean you are not allergic, as individual responses vary.
Can this test be used to diagnose ragweed allergy?
Yes, this test can help identify if you have an allergy to giant ragweed. However, it is often used alongside other tests or symptoms to confirm the diagnosis. Allergy testing should be done by a healthcare provider.
Is there any risk or discomfort from this test?
The test involves a small blood draw, which may cause mild discomfort or bruising at the site. Rarely, there may be a slight reaction at the injection site, such as redness or swelling. Most people tolerate the test well.
  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