Medical Authors and Editors: Barbara K. Hecht, PhD and Frederick Hecht, MD
On July 7, 2004, the US Food and Drug Administration (FDA) announced that it has approved a diagnostic test called NeutroSpec. The NeutroSpec test employs a mouse monoclonal antibody which is radioactive and binds to a specific type of activated white blood cell.
How the test works
Since this type of white blood cell is active in fighting infections, these cells tend to congregate at the site of infection. (Think of them as firefighters.) When the monoclonal antibodies arrive on the scene, they bind to the white blood cells. A gamma camera can then be used to scan the body for any "hot spots." The hot spots mean that the radioactive monoclonal antibodies and hence, the white blood cells are concentrated at the site of infection.
The NeutroSpec test appears to be highly accurate in cases of appendicitis. After one hour, the test was reportedly "nearly 100% accurate" in diagnosing appendicitis. This test could mean that surgeries that end up removing a normal appendix could become a thing of the past.
Note: At the present time, the NeutroSpec test is approved for people 5 years and older.