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Many questions remain regarding the efficacy, risks, and costs of CF neonatal screening. The major gap in knowledge that must be closed before CF neonatal screening can be recommended generally in the United States concerns the potential long-term medical benefits of initiating treatment in early infancy. It would be premature, in our opinion, to implement mass population screening of newborns for CF until the benefits and risks have been fully defined, and an adequate and logistically feasible testing system developed and/or highly effective therapy for CF lung disease becomes available. It is for this reason we designed a randomized, controlled investigation of CF neonatal screening and implemented this project in Wisconsin during 1985. The fact that 5 years of randomized screening and systematic evaluation of outcome measures have not yet revealed any pulmonary benefits underscores the importance …