Which phase is used to detect IgM antibodies in testing?

Which phase is used to detect IgM antibodies in testing?

• A. IgA
• B. IgG
• C. IgE
• D. IgM

Answer: (D)

Detecting IgM antibodies points to the early, acute phase of an infection. IgM is the first antibody produced after exposure to an antigen and appears quickly, signaling a recent or current infection before IgG rises. Tests that target IgM are designed to capture this early window, whereas IgG reflects longer-term or past immunity, IgA is mainly a mucosal antibody, and IgE is tied to allergic responses and certain parasitic infections. So, the presence of IgM in testing is the best indicator of the acute phase.

Detecting IgM antibodies points to the early, acute phase of an infection. IgM is the first antibody produced after exposure to an antigen and appears quickly, signaling a recent or current infection before IgG rises. Tests that target IgM are designed to capture this early window, whereas IgG reflects longer-term or past immunity, IgA is mainly a mucosal antibody, and IgE is tied to allergic responses and certain parasitic infections. So, the presence of IgM in testing is the best indicator of the acute phase.