- Infants with birth weights less than 1,500 grams admitted to Baylor University Medical Center (BUMC) NICU with any of the following lines are eligible for inclusion into this study up to 72 hours after birth: umbilical arterial line (UAL), umbilical venous line (UVL), peripheral arterial line (PAL), peripheral long line (PLL), and central venous line (CVL).