Definition

1. Noun:
   • A type of antibody: Immunoglobulin M is one of the five primary classes of antibodies (immunoglobulins) found in the blood and lymph fluid of vertebrates.
   • First responder in infection: It is the first antibody to be produced by the immune system in response to an initial exposure to a new antigen, such as a bacterium or virus.
   • Activator of further immune response: It plays a crucial role in activating the complement system and stimulating the production of other antibodies, specifically immunoglobulin G.

Usage Examples

• Noun:
  • A high level of immunoglobulin M in the blood can indicate a recent or active infection.
  • The test confirmed the presence of specific immunoglobulin M against the virus.
  • Immunoglobulin M is a large, pentameric molecule that is effective at agglutinating pathogens.

Advanced Usage

• "IgM": This is the standard abbreviation for immunoglobulin M, commonly used in medical and scientific literature.
  • The patient's IgM titers were elevated, suggesting a primary immune response.
• "IgM antibody": A specific term used to denote an antibody of the IgM class.
  • The assay detects IgM antibodies to the dengue virus.

Variants and Related Words

• IgM (n): The standard abbreviation for immunoglobulin M.
• Immunoglobulin (n): The general term for a class of glycoprotein antibodies. Immunoglobulin M is a specific subclass.
• Antibody (n): A protein produced by the immune system to neutralize pathogens. Immunoglobulin M is a type of antibody.

Synonyms

• IgM: The direct abbreviation.
• Primary antibody: In the context of the initial immune response, though this is a functional description rather than a perfect synonym.

Related Phrases

• IgM deficiency: A medical condition characterized by low levels of immunoglobulin M.
  • The child was diagnosed with selective IgM deficiency.
• IgM serology: The detection and measurement of IgM antibodies in blood serum for diagnostic purposes.
  • IgM serology is crucial for diagnosing acute-phase infections.

Noun

1. one of the five major classes of immunoglobulins; involved in fighting blood infections and in triggering production of immunoglobulin G