Skip to content

Antibody Screen

Published: July 27, 2026Updated: August 25, 2026

An antibody screen measures the presence of antibodies in the blood, which can indicate exposure to certain diseases or immune system responses.

Quick summary

Antibody screen detects antibodies in the blood to identify immune responses or past exposures.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
result
Clinical utility
diagnostic
Result kind
qualitative
FDA-cleared
Ortho Antibody Screen, Bio-Rad ID-Card, Immucor PreciseView
interpretation: {"text":"A positive result indicates the presence of antibodies, suggesting past exposure to a specific pathogen or an immune response from vaccination.","label":"Positive"}; {"text":"A negative result means that no antibodies were detected, suggesting no current or past exposure to the tested pathogens.","label":"Negative"}

An antibody screen is a laboratory test that checks for the presence of antibodies in the blood. Antibodies are proteins produced by the immune system in response to foreign substances, such as bacteria or viruses.

This test is often used to determine if a person has been exposed to certain diseases, such as hepatitis or HIV, or to assess the immune response to vaccinations.

The results of an antibody screen are typically reported as positive or negative, indicating the presence or absence of specific antibodies.

Frequently asked questions

What does a positive antibody screen mean?
A positive result indicates that the person has been exposed to a specific pathogen or has developed antibodies through vaccination.
Can an antibody screen diagnose an active infection?
No, an antibody screen can only indicate past exposure or immune response, not necessarily an active infection.
  1. 1
    Mayo Clinic: Antibody TestsSource
  2. 2
    CDC: Understanding Antibody TestingSource

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 25, 2026. · Read our editorial policy