Skin residual bilirubin volume: a physiologically informed framework for transcutaneous bilirubin interpretation in neonates
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By
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H. O. Amadi
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May 14, 2026
Clinical Report: Assessing Skin Residual Bilirubin Volume in Newborns
Overview
This study evaluates skin residual bilirubin volume (SRBV) as a physiological explanation for discrepancies between transcutaneous bilirubin (TcB) and total serum bilirubin (TSB) measurements in newborns. Findings suggest that incorporating SRBV into TcB interpretation can enhance monitoring and safety in neonatal jaundice management.
Background
Neonatal jaundice is a prevalent condition affecting a significant percentage of newborns, necessitating accurate bilirubin measurement for effective management. Transcutaneous bilirubinometry (TcB) serves as a non-invasive alternative to laboratory-based TSB testing, particularly in resource-limited settings. However, the inconsistency between TcB and TSB measurements raises concerns about TcB's reliability as a standalone diagnostic tool.
Data Highlights
| Measurement Type | Findings |
|---|---|
| TBL-out | Consistently lower than TBL-return early in treatment |
| RVP Phenomenon | Observed as TBL-return becomes lower than TBL-out with bilirubin decline |
| SRBV Contribution | Varies with bilirubin level and treatment phase |
Key Findings
- Transcutaneous bilirubin levels (TBL) often exceed total serum bilirubin (TSB) in paired measurements.
- Persistent cutaneous bilirubin is indicated by TBL-return exceeding TBL-out early in treatment.
- The Recovery Value Flip (RVP) phenomenon is reproducible, marking a shift in TcB behavior during bilirubin decline.
- SRBV provides a biologically plausible explanation for TcB-TSB discordance.
- Incorporating SRBV into TcB interpretation improves monitoring in laboratory-limited settings.
Clinical Implications
Healthcare professionals should consider the role of SRBV when interpreting TcB measurements to enhance the accuracy of jaundice management in newborns. This approach may lead to improved safety and reliability in settings where laboratory testing is not readily available.
Conclusion
Incorporating skin residual bilirubin volume into the interpretation of transcutaneous bilirubin measurements can significantly enhance the management of neonatal jaundice, particularly in resource-limited environments.
Related Resources & Content
- Canadian Paediatric Society, Guidelines for detection and management of hyperbilirubinemia in term and late preterm newborns, 2025 -- Hyperbilirubinemia in Newborns
- Transcutaneous bilirubin in newborns before, during, and after home phototherapy, PubMed, 2025 -- Results from a secondary analysis of a randomized controlled trial
- Evaluating Liver Resection Criteria and the Role of Liver Function Assessments in Clinical Practice
- Journal of Gastrointestinal Surgery — Evaluation of Predicted Remnant Liver Function via Hepatobiliary Scintigraphy in Patients Undergoing Significant Liver Resection
- Intraoperative Assessment of Post-Surgical Bile Leakage Utilizing Bilirubin-Inducible Fluorescent Protein
- Frontiers in Pediatrics — Metabolic maturity patterns in neonates: dissecting the interactive effects of gestational age and birth weight on metabolic profiles
- Guidelines for detection and management of hyperbilirubinemia in term and late preterm newborns (≥35 weeks gestational age) | Canadian Paediatric Society
- Transcutaneous bilirubin in newborns before, during, and after home phototherapy-Results from a secondary analysis of a randomized controlled trial - PubMed
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