RT Book, Section A1 Gomella, Tricia Lacy A1 Cunningham, M. Douglas A1 Eyal, Fabien G. A1 Tuttle, Deborah J. SR Print(0) ID 1107527788 T1 Hyperbilirubinemia, Unconjugated T2 Neonatology: Management, Procedures, On-Call Problems, Diseases, and Drugs, 7e YR 2013 FD 2013 PB McGraw-Hill Education PP New York, NY SN 9780071768016 LK accesspediatrics.mhmedical.com/content.aspx?aid=1107527788 RD 2024/03/29 AB An infant's indirect (unconjugated) serum bilirubin level is 10 mg/dL. The exact definition of a physiologic range and management of indirect hyperbilirubinemia is complex and based on many factors, including gestational age (GA), postnatal age, birthweight, disease state, risk factors, degree of hydration, nutritional status, and ethnicity. Total serum bilirubin (TSB) is the sum of direct (conjugated) and indirect (unconjugated) and can be measured in the blood. The indirect bilirubin is calculated by subtracting the direct bilirubin from the total bilirubin. Transcutaneous bilirubin (TcB) is a measurement of total serum bilirubin from an instrument that uses reflectance measurements on the skin and correlates well with the laboratory TSB value.