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©2013 UpToDate ® Print Email Algorithm for the diagnosis of cystic fibrosis IRT: immunoreactive trypsinogen; DNA: genetic screen for CF transmembrane conductance regulator (CFTR) gene mutations. * For asymptomatic infants with intermediate sweat chloride results, test should be repeated at 1 to 2 months of age. • DNA testing may not be necessary at this stage if newborn screen included DNA testing and identified two CF-causing mutations. Δ "CF-related mutations" denotes mutations in the CFTR gene that are known to cause disease. Courtesy of Julie P Katkin, MD.