A Bilirubin Total & Direct test is a blood test measuring bilirubin levels to assess liver function, diagnose jaundice, liver diseases (like hepatitis, cirrhosis), and bile duct issues (like gallstones). It checks Total Bilirubin (sum of direct & indirect) and Direct Bilirubin (liver-processed, water-soluble) to pinpoint if high levels come from the liver (direct) or red blood cell breakdown (indirect). Key symptoms prompting this test include yellow skin/eyes (jaundice), dark urine, and abdominal pain