The document discusses the assessment of liver function through bilirubin analysis. It provides a brief history of bilirubin testing methodology and describes the Jendrassik method for determining total and conjugated bilirubin levels. This method involves a reaction between bilirubin in a serum sample and diazotized sulfanilic acid to form a colored complex that can be measured spectrophotometrically. The document also provides reference ranges for bilirubin levels and discusses two case studies involving abnormal liver function test results.