Physiology Which of the following clinical laboratory observations is suggestive of Hanup disease? A Burnt sugar smell in urine B High plasma phenylalanine levels C Extremely high levels of citrulline in urine D High fecal levels of tryptophan and indole derivatives 💡 Explanation Which of the following clinical laboratory observations is suggestive of Hanup disease? ✓ Correct Answer: D. High fecal levels of tryptophan and indole derivatives