It has been described that the pubertal growth spurt is delayed and it is of low intensity and duration in CRI. The purpose of this study was to evaluate height (SDS), height Δ SDS, creatinine clearance (Cr Cl) and mean corticosteroid dose in hydrocortisone equivalents in 11 females (F) and 13 males (M) with CRI after renal Tx. during the early phases of pubertal development. Mean ±SD chronological age (CA) was 13.8±1.56 (F) and 15.0±2.29 years (y) (M), bone age (BA) 10.9±3.03 (F) and 12.7±1.77 y (M), CA-BA 2.77±2.13 (F) and 2.74±2.58 y (M), height (SDS) -3.54±1.39 (F) and -3.42±1.84 (M), cort dose 26.6±7.19 (F) and 22.4±8.21 mg/m2 (M), and Cr Cl 82.0±37.3 (F) and 89.3±36.8ml/min.1.73 (M). No significative sex difference was found in all parameters evaluated. Δ SDS were calculated on periods greater than 1 y (X±DS 2.12±0.97 y) in Tanner's stages 1 to 3. Patients were divided in 2 groups (Gr) as a function ofΔSDS: Gr1 (poor growth) with a ΔSDS ≥-0.5 and Gr2 (Acceptable growth) with a ΔSDS ≤-0.5. The percentage of patients in Gr1 was 70% and in Gr2 30%. These percentages were significantly different (p=0.01). No correlation was found between ΔSDS and cort dose neither betweenΔSDS and Cr Cl. It is concluded that patients with CRl after renal Tx grow poorly during early puberty, and this probably affects final stature.Footnote 1