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Serum Antibody Test for Heterophile Antigens (Monoclonal Antibody Screening)

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

This test checks for the presence of antibodies that may react with non-human proteins, often used initially to evaluate potential autoimmune conditions or infectious diseases like infectious mononucleosis.

Quick summary

["Helps identify possible immune responses to unknown pathogens or autoimmune activity."]

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

Key facts at a glance

LOINC
6424-6
Short code
Heteroph Ab Titr Ser Aggl
Synonyms
Heteroph Ab Titr Ser Aggl
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
aggl
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 This Test Measures

The test detects heterophile antibodies—proteins produced by the immune system that can bind to foreign substances (antigens) from animals or other sources. These antibodies are sometimes found in conditions like Epstein-Barr virus infection or certain autoimmune disorders.

Why It’s Ordered

Your doctor may recommend this test if you have symptoms like fatigue, swollen lymph nodes, or unexplained infections, especially if other tests (like a monospot test) are inconclusive. It can also be part of a broader evaluation for autoimmune diseases.

Sample Collection and Preparation

A blood sample is drawn from a vein, usually in your arm. The blood is processed to separate serum (the liquid part) for testing. This test does not require fasting or special preparation.

Test Method and Results

The test uses a monoclonal antibody-based method to detect heterophile antibodies. Results are qualitative (positive/negative) rather than quantitative, meaning it tells you if antibodies are present but not their exact amount.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

A positive result suggests a possible immune response to infectious agents (e.g., Epstein-Barr virus) or, rarely, autoimmune conditions. A negative result means no detectable heterophile antibodies in this sample. Follow-up testing may be needed to clarify diagnosis.

Short name

Heterophile Antibody Screen

Frequently asked questions

What does a positive result mean?
A positive result may indicate an active infection (like infectious mononucleosis) or a rare autoimmune reaction. Your doctor will discuss next steps, such as additional blood tests or further evaluation.
Can this test be done at home?
No, this test requires a lab sample collected by a healthcare professional. Home tests for antibodies are not standard for this specific screening.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on lab processing times. Your doctor will contact you with the outcome.
  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