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Direct bilirubin levels observed in prolonged neonatal jaundice: a retrospective cohort study

Hodgson, JM; van Someren, VH; Smith, C; Goyale, A; (2018) Direct bilirubin levels observed in prolonged neonatal jaundice: a retrospective cohort study. BMJ Paediatrics Open , 2 (1) , Article e000202. 10.1136/bmjpo-2017-000202. Green open access

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Abstract

OBJECTIVE: Prolonged neonatal jaundice is common and usually benign; however, assessment of bilirubin fractions is recommended to determine the need for further assessment for congenital liver disease, particularly biliary atresia. The direct (conjugated) bilirubin thresholds currently used are variable and poorly evidenced. Hence, we aimed to delineate direct bilirubin levels in disease-free neonates with prolonged jaundice. METHODS: We performed a retrospective cohort analysis of split bilirubin levels, and subsequent follow-up, for all neonates initially assessed in our prolonged neonatal jaundice clinic over 2 years. We plotted centile charts for total, direct and direct-total bilirubin ratio levels against age at sampling. The association was assessed using linear regression analysis. RESULTS: Data were collected for 420 neonates (501 blood samples) across an age range of 10-70 days. No significant liver disease was found. For each day of older age, total bilirubin fell by 3.72 µmol/L (95% CI 2.46 to 5.00) and direct bilirubin fell by 0.39 µmol/L (0.18 to 0.59). The ratio between the two did not change significantly (-0.0006 to +0.0034). The 95th centile for direct bilirubin was stable at ~25 µmol/L. Direct-total bilirubin ratio was very variable with some 95th centiles >30%. CONCLUSIONS: In a clinically relevant population of disease-free neonates with prolonged jaundice both the total and the direct bilirubin decreased with age. The absolute direct bilirubin is more useful clinically than the direct-total bilirubin ratio. Our results support National Institute for Health and Care Excellence guidance that conjugated bilirubin >25 µmol/L, or even more stringent criteria, constitutes an appropriate threshold for further investigation for neonatal liver disease.

Type: Article
Title: Direct bilirubin levels observed in prolonged neonatal jaundice: a retrospective cohort study
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1136/bmjpo-2017-000202
Publisher version: http://doi.org/10.1136/bmjpo-2017-000202
Additional information: This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/
Keywords: Biochemistry, hepatology, jaundice, metabolic, neonatology
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute for Global Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute for Global Health > Infection and Population Health
URI: https://discovery.ucl.ac.uk/id/eprint/10047018
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