Renal immaturity mimicking chronic renal failure in an infant born at 22 weeks gestational age.

Glomerular function shows a progression directly correlated to gestational age (GA) and postnatal age in preterm infants. In preterms, glomerular filtration rate (GFR) is significantly lower than in term infants, and it matures more slowly in the postnatal period. In infants with very low GA, due to decreased GFR, normalization of serum creatinine values may be prolonged during recovery from acute renal failure (ARF). Herein, we report an extremely premature infant with high creatinine values from third week up to third month of life which normalized thereafter mimicking chronic renal failure.