What might cause a positive result for bilirubin or urobilinogen?

A positive result for bilirubin in urine may indicate liver dysfunction, bile duct obstruction, or hemolysis, as it suggests excess bilirubin is being excreted due to impaired processing by the liver. Conversely, elevated urobilinogen levels can occur in conditions such as hemolytic anemia or liver disease, where there is increased bilirubin breakdown and altered liver function. In both cases, further investigation is often required to determine the underlying cause.