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Background. Small children are less frequently transplanted when compared with older. The objective of the present study was to compare the preparation time for transplantation in children of different weights and to identify factors associated with a delay in the workup of small children. Methods. We report on a retrospective cohort comprising all children referred for renal transplantation (RTx) workup between 2009 and 2017. The main outcome was transplantation workup time, defined as the time elapsed between the first consultation and when the child became ready for the surgery. Results. A total of 389 children (63.5% males) were selected, with a median weight of 18 kg (interquartile range, 11–32). Patients were categorized into 2 groups: group A (study group): ≤15 kg (n = 165) and group B (control group): >15 kg (n = 224). The probability of being ready for RTx was comparable between groups A and B. The cumulative incidence rate difference between groups is −0.05 (95% confidence interval, −0.03 to 0.02). The median time for RTx workup was 5.4 (2.4–9.4) in group A and 4.3 (2.2–9.0) months in group B (P = 0.451). Moreover, the presence of urinary tract malformation was associated with the need for longer transplantation workup time (P < 0.001). Conclusions. In children >7 kg, the workup time for transplantation is not related to body weight. In a specialized center, children weighing 7–15 kg became ready within the same timeframe as children weighing >15 kg, despite the smaller children had greater difficulty being nourished, dialyzed, and a greater need for surgical correction of the urinary tract pretransplant.

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