An IgM test or Immunoglobulin M test is a very common test that counts the Immunoglobulin M quantities in a person’s blood sample. Immunoglobulins are chemicals that our bodies synthesize to combat an antigen or harmful organism. The IgM is the first antibody synthesized in our body to fight a new infection. It tests blood and lymphatic fluid to check whether or not the first response to a new infection is fully functional or not. Infection from human parainfluenza virus (HPIV) is easy to detect by polymerase chain reaction, immunofluorescence method, isolation method, or from observation of serum specimens.