The Need for Quality Improvement in Sweat Testing Infants after Newborn Screening for Cystic Fibrosis

The proportion of insufficient sweat tests after positive newborn screening for cystic fibrosis was determined. Infants ≤3 months old had a mean (±standard deviation) rate of 7.2% (±7.6) (range, 0% to 40%). Collection methods did not affect the rates. The high and variable rates indicate a need for quality improvement.