https://www.prometheusbio.com/products/canine-parvovirus-antigen-cpv-ag-test/ Canine Parvovirus Antigen (CPV Ag)Test Kit The Canine Parvovirus Antigen (CPV Ag) test is a diagnostic test used to detect the presence of CPV antigen in a dog's feces or vomit, usually done using a rapid immunochromatographic assay. A small sample of the dog's feces or vomit is collected and mixed with a solution on a test strip. The CPV Ag test kit contains specific antibodies that will bind to the CPV antigen if it is present in the sample. This binding reaction produces a visible line or color change on the test strip, indicating a positive result for CPV infection.