Study of the Variability of Transcutaneous Bilirubin Determinations Between Different Ethnic Groups

Abstract

Background: Pathological hyperbilirubinemia often leads to hospital readmission within the first week of life, with increased risk of neurological damage if untreated. Transcutaneous bilirubin (TcB) measurement was integrated into neonatal screening to estimate total serum bilirubin (SB) concentrations. Despite TcB and SB generally correlating well, discrepancies can occur based on race/ethnicity. Falsely elevated TcB readings may be obtained in darker skin pigmentation. Aims: This study compared TcB and SB across different ethnic groups to assess correlation patterns and identify the best TcB measurement method in neonates. Methods: Term and late preterm neonates delivered at the University Hospital of Vic were included. Each newborn underwent TcB assessment (in the forehead, sternum, and both sites simultaneously) concomitantly with SB measurement. The correlations between both parameters were analyzed. Results: A total of 148 neonates were categorized as White/Caucasian (58), Chinese (3), Indian (17), Black/African (22), Latino (11), Arab (25), or mixed (12). The groups were homogeneous, with statistical differences in delivery and feeding (p = 0.032 and p p p < 0.001). Conclusions: TcB correlated well with SB, but accuracy varied among ethnic groups. An individualized interpretation of TcB based on skin pigmentation is supported. Mid-sternum determination was the best TcB measurement method.

Keywords

• neonatal hyperbilirubinemia
• neonatal jaundice
• kernicterus
• phototherapy
• ethnicity
• skin pigmentation