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Published on: August 24, 2011
Newborn Direct or Conjugated Bilirubin Measurements As a Potential Screen for Biliary Atresia
Sanjiv Harpavat1, Ramya Ramraj, Milton J Finegold
1*Department of Pediatrics, Division of Gastroenterology, Hepatology, and Nutrition†Department of Pathology‡Department of Surgery, Division of Pediatric Surgery, Baylor College of Medicine and Texas Children's Hospital, Houston.
Insights
Newborn direct or conjugated bilirubin (DB or CB) measurements show high sensitivity and specificity for detecting biliary atresia (BA). This bilirubin screening strategy could improve early diagnosis and outcomes for infants with BA.
Area of Science:
- Neonatology
- Pediatric Gastroenterology
- Medical Diagnostics
Background:
- Biliary atresia (BA) screening is linked to better infant outcomes, yet no US screening program exists.
- Current diagnostic methods for BA can be invasive and delayed.
- Early detection of BA is crucial for timely intervention and improved prognosis.
Purpose of the Study:
- To evaluate the sensitivity and specificity of newborn direct or conjugated bilirubin (DB or CB) measurements as a screening tool for biliary atresia (BA).
- To explore potential strategies for enhancing the specificity of bilirubin-based BA screening.
Main Methods:
- Retrospective analysis of two infant groups: one diagnosed with BA and a control group without BA.
- Calculation of sensitivity using DB or CB measurements from infants with confirmed BA diagnoses.
- Calculation of specificity using DB or CB measurements from a non-BA infant cohort.
Main Results:
- Newborn DB or CB measurements demonstrated 100% sensitivity for detecting BA.
- Specificity for BA screening using DB or CB measurements was 98.2%.
- Adjusting reference intervals to 99% and implementing repeat testing further improved specificity.
Conclusions:
- Newborn DB or CB measurements present a highly sensitive and specific potential screening strategy for biliary atresia (BA).
- Specificity can be enhanced through methods like 99% reference intervals and repeat testing.
- These findings support further prospective research into the efficacy of bilirubin screening for BA.
Objectives:
Although screening for biliary atresia (BA) is associated with improved outcomes, no screening program currently exists in the United States. In this study, we explore the possibility of a screening strategy based on newborn direct or conjugated bilirubin (DB or CB) measurements. Our objective is to estimate testing's sensitivity and specificity for BA.
Methods:
Two groups were examined retrospectively. For sensitivity calculations, a BA group consisting of infants born between January 2011 and December 2014, diagnosed with BA, and cared for at a pediatric gastroenterology referral center was examined. For specificity calculations, a non-BA group that comprised of infants born between June 2009 and August 2011 in a hospital with a policy of checking newborn bilirubin concentrations was studied.
Results:
All 35 infants with newborn DB or CB measurements in the BA group had elevated concentrations, translating to a sensitivity of 100% (95% CI 87.7-100). In the non-BA group, 8936 of 9102 infants had DB concentrations within the laboratory's reference interval, translating to a specificity of 98.2% (95% CI 97.9-98.4). Three methods-calculating direct:total bilirubin ratios, using 99% reference intervals, and repeat testing-changed specificity to different degrees.
Conclusions:
Newborn DB or CB measurements may have a high sensitivity and specificity for BA. Specificity can be further improved by using 99% reference intervals and/or repeat testing. Our findings can serve as the foundation for larger prospective studies, to determine whether newborn DB or CB measurements can be an effective screening strategy for BA.
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