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Reagin Antibody (Serum) by Qualitative Immunoassay

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

This test detects the presence of reagin antibodies in your blood, which may be linked to certain allergic reactions or parasitic infections.

Quick summary

["Reagin antibodies can help identify potential allergic or parasitic exposure that your doctor may need to investigate further."]

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

Key facts at a glance

LOINC
22464-2
Short code
Reagin Ab Spec Ql
Synonyms
Reagin Ab Spec Ql
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 a Reagin Antibody?

Reagin antibodies are a type of antibody (immunoglobulin) that can cause allergic reactions, including hives, swelling, or breathing difficulties. They are often tested in response to suspected allergic or parasitic conditions, such as parasitic infections like schistosomiasis.

Why Might This Test Be Ordered?

Your healthcare provider may order this test if you have symptoms like skin rashes, respiratory issues, or other signs of an allergic reaction. It could also be used to diagnose or monitor parasitic infections where reagin antibodies are relevant.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The sample is then tested using an immunoassay method to detect the presence of reagin antibodies.

What Do the Results Mean?

A positive result indicates the presence of reagin antibodies, which may suggest an allergic reaction or parasitic exposure. A negative result means no detectable antibodies were found in this test. Results should be interpreted by your doctor 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

Reagin Antibody (Serum) Test

Frequently asked questions

What causes reagin antibodies to appear in the blood?
Reagin antibodies may develop in response to allergic reactions or parasitic infections, such as schistosomiasis. They can also be associated with other immune responses where antibodies play a role in hypersensitivity reactions.
Can this test be used to diagnose allergies?
While this test can indicate the presence of reagin antibodies, it is not the primary test for diagnosing allergies. Allergy testing often involves skin prick tests or blood tests for specific allergens. Your doctor will determine the best approach based on your symptoms and medical history.
Are there any side effects from this blood draw?
Most people experience only mild discomfort or bruising at the injection site. Rarely, there may be a slight swelling or pain. If you experience excessive bleeding, severe pain, or signs of infection (like increased redness or warmth), contact your healthcare provider immediately.
  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