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What is immunoglobulin G?

ANSWER

Immunoglobulin G (IgG) is the most common type of antibody in your blood and other body fluids. These antibodies protect you against infection by "remembering" which germs you've been exposed to before.

If those germs come back, your immune system knows to attack them. Your doctor can test for IgG to figure out whether you've been infected by certain kinds of bacteria or virus.

From: What Is an Immunoglobulin Test? WebMD Medical Reference

SOURCES:

American Association for Clinical Chemistry: "Quantitative Immunoglobulins: At a Glance," "Quantitative Immunoglobulins: Test Sample," "Quantitative Immunoglobulins: The Test."

Mayo Clinic: "Lumbar puncture (spinal tap): What you can expect."

Nemours Foundation: "Blood Test: Immunoglobulins (IgA, IgG, IgM)."

Pagana, Kathleen Deska. , 2016. Mosby's Diagnostic and Laboratory Test Reference

University of Rochester Medical Center: "Quantitative Immunoglobulins."

Reviewed by Melinda Ratini on August 9, 2019

SOURCES:

American Association for Clinical Chemistry: "Quantitative Immunoglobulins: At a Glance," "Quantitative Immunoglobulins: Test Sample," "Quantitative Immunoglobulins: The Test."

Mayo Clinic: "Lumbar puncture (spinal tap): What you can expect."

Nemours Foundation: "Blood Test: Immunoglobulins (IgA, IgG, IgM)."

Pagana, Kathleen Deska. , 2016. Mosby's Diagnostic and Laboratory Test Reference

University of Rochester Medical Center: "Quantitative Immunoglobulins."

Reviewed by Melinda Ratini on August 9, 2019

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What is immunoglobulin M?

WAS THIS ANSWER HELPFUL

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.

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