Public health nurses (PHNs) can play an important role in the detection of domestic violence. This study examines whether the introduction of a domestic violence assessment protocol by public health nurses in a maternal and child health visiting program increases the identification and referral rates of women experiencing domestic violence. Data collected from case files during the baseline year prior to the initiation of the protocol were compared to case file information after the protocol had been implemented. When the protocol was used, there was a higher rate of identification, although the difference was not statistically significant. Significantly more women, however, were provided with information about domestic violence resources after the protocol was in place, and significantly more women were referred to services in the second year after the protocol had been implemented. This study provides support for the use of a domestic violence protocol to improve the public health nursing response to domestic violence.