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Forsythia IgE Quantification (Serum)

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

This test measures the amount of Immunoglobulin E (IgE) antibodies in your blood. IgE is linked to allergic reactions and certain immune responses.

Quick summary

["IgE levels help identify allergies or immune conditions."]

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

Key facts at a glance

LOINC
100792-1
Short code
Forsythia IgE Qn
Synonyms
Forsythia 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 IgE Measure?

IgE (Immunoglobulin E) is a type of antibody produced by your immune system in response to allergens (substances like pollen, dust, or certain foods) or in chronic inflammatory conditions. Elevated IgE levels may suggest allergies, asthma, or other allergic disorders.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like sneezing, itching, skin rashes, or breathing difficulties. It can also help diagnose conditions like allergic rhinitis, eczema, or certain parasitic infections.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The blood is then sent to a lab for analysis using an immunoassay method to measure IgE levels.

What Are Possible Results?

Results are reported as a concentration of IgE in the blood. Higher than normal levels may indicate allergies or immune-related conditions, while lower levels may suggest a reduced immune response to allergens.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: IgE plays a key role in allergic reactions by triggering the release of histamine and other chemicals that cause symptoms like swelling, itching, and inflammation. Elevated IgE is often associated with allergic disorders, while chronic or very high levels may indicate conditions like atopic dermatitis or certain parasitic infections. Low IgE levels can sometimes suggest a deficiency in allergic responses but may also occur in non-allergic inflammatory conditions.

Short name

IgE Level (Serum)

Frequently asked questions

What does an elevated IgE level mean?
An elevated IgE level often suggests an allergic reaction or an immune response to certain triggers. This can help guide treatment for allergies, asthma, or other allergic conditions.
How long does it take to get results?
Results are typically available within 1 to 3 business days, depending on your lab’s processing time.
Can IgE levels change over time?
Yes, IgE levels can fluctuate based on exposure to allergens, underlying health conditions, or medications. Regular monitoring may be needed if you have chronic allergies or related conditions.
  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