[en] To determine the association between workload and diagnostic errors on ${}^{18}$F-FDG-PET/CT. This study included 103 ${}^{18}$F-FDG-PET/CT scans with a diagnostic error that was corrected with an addendum between March 2018 and July 2023. All scans were performed at a tertiary care center. The workload of each nuclear medicine physician or radiologist who authorized the ${}^{18}$F-FDG-PET/CT report was determined on the day the diagnostic error was made and normalized for his or her own average daily production (workload${}_{normalized}$). A workload${}_{normalized}$ of more than 100% indicates that the nuclear medicine physician or radiologist had a relative work overload, while a value of less than 100% indicates a relative work underload on the day the diagnostic error was made. The time of the day the diagnostic error was made was also recorded. Workload${}_{normalized}$ was compared to 100% using a signed rank sum test, with the hypothesis that it would significantly exceed 100%. A Mann-Kendall test was performed to test the hypothesis that diagnostic errors would increase over the course of the day. Workload${}_{normalized}$ (median of 121%, interquartile range: 71 to 146%) on the days the diagnostic errors were made was significantly higher than 100% (P = 0.014). There was no significant upward trend in the frequency of diagnostic errors over the course of the day (Mann-Kendall tau = 0.05, P = 0.7294). Work overload seems to be associated with diagnostic errors on ${}^{18}$F-FDG-PET/CT. Diagnostic errors were encountered throughout the entire working day, without any upward trend towards the end of the day.