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(a) Total monthly number of successful and ‘quantity not sufficient’ sweat chloride test results from January 2017–December 2019. Timing of quality improvement measures (as outlined in Table 1) are included for correlation with sweat chloride test quantity not sufficient (QNS) and success numbers and rates. (b) Monthly percentages of successful and ‘quantity not sufficient’ sweat chloride results from January 2017–December 2019.
