In the article “Comparison of Accuracy Between 13C- and 14C-Urea Breath Testing: Is an Indeterminate-Results Category Still Needed?” by Charest and Bélair (J Nucl Med Technol. 2017;45:87–90), the “Analysis of Negative Results” section incorrectly states that the average of 366 patients with negative 14C results was 0.0118 ± 0.0050 cps. The correct average is 0.118 ± 0.050 cps. The “Analysis of Positive Results” section incorrectly states that the average of 196 patients with positive 14C results was 0.300 ± 0.172 cps, with a corresponding 5.210 ± 0.172 S/CO. The correct average and corresponding S/CO are 2.998 ± 1.719 cps and 9.084 ± 5.210, respectively. In addition, the “Analysis of Positive Results” section incorrectly states that the average 20.658 ± 10.359 %Δ was determined from 119 patients with negative 13C results; the average was obtained from 119 patients with positive 13C results. The authors regret these errors.