Serum Creatinine Curves During the First 2 Postnatal Weeks
A total of 8757 serum creatinine values were obtained during the first 2 postnatal weeks with a median (IQR) of 11 (7 to 13) values per patient. The median (IQR) peak negative fluid balance was −10.3% (−14.6% to −5.6%) on median (IQR) postnatal day 3 (2 to 5). Median (IQR) peak positive fluid balance in the first 2 postnatal weeks in this population was 11.1% (4.3% to 19.6%) and occurred on median (IQR) postnatal day 12 (8 to 14). A total of 93 (10.1%) neonates never dropped below their birth weight.Uncorrected and fluid-corrected serum creatinine curves are shown for the entire cohort and by gestational age group (