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What is the IgG test?

Published in Blood Test 2 mins read

The IgG test is a blood test used to measure the levels of Immunoglobulin G (IgG) in the blood. This test is crucial for diagnosing IgG deficiency, a condition where the body doesn't produce enough of this important antibody.

Understanding Immunoglobulin G (IgG)

  • What is IgG? Immunoglobulin G, or IgG, is the most common type of antibody in the blood. It plays a vital role in the immune system by protecting against infections.
  • IgG Deficiency: When the body doesn't produce enough IgG, it can lead to an increased risk of infections.
  • Possible Causes: While the exact cause of IgG deficiency isn't always clear, genetics may play a role.

How the IgG Test Works

  • Blood Sample: The IgG test requires a simple blood sample.
  • Measurement: The test measures the amount of IgG present in the blood.
  • Diagnosis: If the levels are below normal, it can indicate an IgG deficiency.

Why is the IgG Test Important?

  • Identifies Deficiencies: The test is critical in identifying individuals with IgG deficiency who are prone to more infections.
  • Guides Treatment: An accurate diagnosis helps healthcare providers determine appropriate treatment plans for the condition.


Feature Description
Type Blood Test
Purpose Measures IgG levels to diagnose deficiencies
Significance Identifies individuals at risk of frequent infections
Key Indicator Immunoglobulin G levels in the blood
Related Term Immunoglobulin G (IgG), IgG deficiency


In summary: The IgG test is a blood test that measures Immunoglobulin G levels, which is important for diagnosing IgG deficiency, a condition that increases susceptibility to infections. The test is critical for patients experiencing frequent infections and aids healthcare providers in creating tailored treatment plans.

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