Which statement about indirect bilirubin is true?

Study liver anatomy and function with our medical students test. Engage with detailed multiple choice questions, each with hints and explanations. Prepare effectively for your test!

Indirect bilirubin is the unconjugated form that is lipophilic and travels in the blood bound to albumin. This protein binding is essential because it allows transport to the liver without being excreted by the kidneys. In the liver, it is taken up by hepatocytes and conjugated with glucuronic acid to form direct (conjugated) bilirubin, which is water-soluble and excreted into bile. So describing indirect bilirubin as unconjugated and transported protein-bound in the serum accurately reflects its properties and fate. The other statements don’t fit because indirect bilirubin is not free in plasma, is not primarily excreted in urine without processing, and is not water-soluble until it’s conjugated.