Abe S, Fujioka K, Nakasone R, et al. - Since a strong correlation was identified between the bilirubin/albumin (B/A) ratio and unbound bilirubin (UB) levels in newborns ≥ 35 weeks of gestation, researchers conducted the study for analyzing the usefulness of B/A ratios in preterm infants. Serum from 381 newborns < 35 weeks of gestation was obtained. Using the glucose oxidase-peroxidase method, UB levels were measured. In preterm infants < 35 weeks of gestation, B/A ratios were better associated with UB levels in infants prior to or never receiving phototherapy than in infants receiving phototherapy.