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Serum or Plasma Soybean IgE Level (Total Immunoglobulin E)

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

This test measures the amount of Immunoglobulin E (IgE), a type of antibody your body produces in response to allergens like pollen, dust, or certain foods. High levels may indicate allergies or other immune-related conditions.

Quick summary

["IgE levels can help diagnose allergies or assess immune responses."]

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

Key facts at a glance

LOINC
6248-9
Short code
Soybean IgE Qn
Synonyms
Soybean IgE Qn
Category
glucose
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 Is Immunoglobulin E (IgE)?

IgE is a protein your immune system produces as part of its defense against certain substances. Normally, your body doesn’t produce high levels of IgE unless exposed to allergens or other triggers. IgE helps trigger the release of chemicals that cause allergic reactions, such as sneezing, itching, or swelling.

Why Might You Need This Test?

Doctors may order this test if you have symptoms like sneezing, itching, rash, or trouble breathing that suggest allergies. It can also help diagnose conditions like asthma, eczema, or certain types of immune disorders.

How Is the Test Performed?

A blood sample is taken from a vein in your arm. The blood is then sent to a lab to measure IgE levels using an immunoassay method, which detects the presence and amount of IgE antibodies in your serum or plasma.

What Do Results Mean?

Results are reported in units of IgE per milliliter (IU/mL). While reference ranges vary by lab, higher than normal levels may suggest allergies or other immune responses. Your doctor will interpret results in the context of your symptoms and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

IgE Total

Frequently asked questions

What causes high IgE levels?
High IgE levels are most commonly linked to allergies (e.g., to pollen, pet dander, or foods). They can also occur with chronic inflammatory conditions, parasitic infections, or certain autoimmune disorders. Lifestyle factors like diet, stress, or exposure to environmental triggers may also play a role.
What should I do if my IgE levels are high?
If your IgE test is elevated, your doctor may recommend allergy testing (like skin prick tests or blood tests) to identify specific triggers. They may also suggest avoiding known allergens, managing symptoms with medications (e.g., antihistamines), or exploring immunotherapy (allergy shots) if needed. Follow-up visits can help monitor your condition.
Can IgE levels change over time?
Yes, IgE levels can fluctuate based on exposure to allergens, immune responses, or underlying health conditions. For example, symptoms like seasonal allergies may cause temporary spikes in IgE. Regular monitoring may be needed if you have chronic allergies or related conditions, but results should always be reviewed by a healthcare provider.
  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