What Is an Antibody?
An antibody, also called an immunoglobulin, is a protein produced by the immune system to recognize and help destroy harmful substances such as bacteria, viruses, fungi, and toxins. Each antibody is designed to recognize a specific target, known as an antigen, allowing the immune system to respond more efficiently to future exposures.
Antibodies are a key part of the body’s adaptive immune response and help protect against many infectious diseases.
Why Antibodies Matter
Antibodies help the immune system identify harmful invaders, reduce the severity of infections, and provide protection after vaccination or recovery from certain illnesses. They also play an important role in diagnosing autoimmune diseases and infections.
Functions of Antibodies
- Recognize bacteria and viruses
- Neutralize harmful toxins
- Mark germs for destruction by immune cells
- Provide long-term immune memory
- Support the effectiveness of vaccines
Types of Antibodies
- IgG
- IgA
- IgM
- IgE
- IgD
When Are Antibody Tests Used?
- Evaluating immune system function
- Diagnosing autoimmune diseases
- Determining previous exposure to certain infections
- Assessing vaccine response in some situations
- Investigating allergic conditions
How Home Care Can Help
Home care professionals help support immune health by encouraging medication adherence, promoting good nutrition, reinforcing infection prevention practices, assisting with chronic disease management, and monitoring for signs of illness that require medical attention.
Home Care Tip
Stay up to date on recommended vaccinations, practice good hand hygiene, and maintain a healthy lifestyle to help support your immune system.
Frequently Asked Questions About Antibodies
What is the difference between an antibody and an antigen?
An antigen is a substance that triggers an immune response, while an antibody is the protein produced by the immune system to recognize and help eliminate that antigen.
Do antibodies last forever?
Some antibodies remain in the body for many years, while others gradually decline over time depending on the infection, vaccine, and individual immune response.
Can antibody testing tell if I am currently sick?
Not always. Antibody tests usually show whether your immune system has responded to an infection or vaccine, not whether an infection is currently active.
When to Contact Your Healthcare Provider
Speak with your healthcare provider if you experience frequent infections, have concerns about your immune system, or have questions about antibody testing or vaccinations.