Monkeypox Virus Ag Test (Colloidal Gold Assay) is an in vitro diagnostic test for the qualitative detection of monkeypox virus antigen in human rash exudates samples. This product is intended to be used by laboratory professional workers as an aid in the diagnosis of infection with monkeypox virus Ag. Any reactive specimen with the monkeypox virus Ag must be confirmed with alternative testing method(s) and clinical findings.

Monkeypox is a viral zoonosis. Its pathogen monkeypox virus is a DNA virus, belonging to the genus orthopoxvirus of poxviridae, which is "close relative" to smallpox virus.