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Reagin antibody titer (serum)

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

This test measures the level of reagin antibodies in your blood, which may help diagnose certain allergic or autoimmune conditions.

Quick summary

["Reagin antibodies can indicate underlying immune responses that may require further medical evaluation."]

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

Key facts at a glance

LOINC
11084-1
Short code
Reagin Ab Titr Ser
Synonyms
Reagin Ab Titr Ser
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 Is Reagin Antibody Titer Used For?

Reagin antibodies are a type of immunoglobulin (IgE) that can be detected in conditions like allergic reactions, certain parasitic infections, or autoimmune disorders. This test helps clinicians assess immune responses that may not be fully understood by standard allergy testing alone.

How Is the Test Performed?

A blood sample is drawn from a vein, typically in your arm. The sample is then sent to a lab for analysis using an immunoassay method to detect reagin antibodies.

What Does a Positive Result Mean?

A positive result suggests the presence of reagin antibodies, which may correlate with allergic or autoimmune activity. However, results alone do not diagnose a specific condition and should be interpreted by your healthcare provider in the context of your symptoms and medical history.

What Are Common Causes?

Reagin antibodies may appear in response to allergic reactions, parasitic infections (such as filariasis), or certain autoimmune conditions. They can also be found in some patients with unexplained chronic symptoms.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Reagin Antibody Test

Frequently asked questions

Why might my doctor order this test?
Your doctor may recommend this test if you have symptoms suggestive of an allergic reaction, chronic skin rashes, or unexplained immune-related symptoms that don’t align with standard allergy testing results. It may also be used in cases where parasitic infections are suspected.
What are the typical results and what do they indicate?
Results are often reported as a titer value (a measure of antibody concentration). Higher titers may indicate a stronger immune response, but interpretation depends on clinical context. Your doctor will discuss findings with you based on your symptoms and medical history.
Do I need to prepare for this test?
No special preparation is needed for this blood test. You may be asked to fast if other tests are being performed simultaneously, but this is not required for reagin antibody testing alone.
  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