Ultrasound transmission gel (USTG) is used in a variety of healthcare settings for both diagnostic and interventional procedures. Its potential role as a vehicle for spread of infections to patients is frequently overlooked. It has been shown on multiple occasions that USTG can become contaminated with bacteria, leading to significant outbreaks of infection among patients.1 ' 7 It is incumbent upon all medical professionals to be aware of the potential risks these products pose to patients. Manufacturers of USTG should label products clearly as to their intended use. Producers of medical devices where USTG is likely to be used should provide explicit instructions on the type of USTG recommended and methods of use. Finally, standardized professional society guidelines would enhance patient safety and improve outcomes. On the basis of our recently described outbreak of infections associated with intrinsically contaminated ultrasound gel7 and a review of all other clusters, we would like to describe the differences between gels and propose guidelines for use of both nonsterile and sterile ultrasound gel.