This is a critical, time-sensitive test for diagnosing Diphtheria, a serious and contagious bacterial infection of the throat and nose. If Diphtheria is suspected, your doctor will collect a simple throat swab from the affected area. In our lab, this sample is grown on a special, selective media that encourages the Diphtheria bacteria to grow while stopping other germs. This allows for a rapid, definitive identification. This is not a routine test. It is an essential, high-priority diagnostic tool that provides the fast, conclusive answer your doctor needs to start life-saving treatment and protect public health.