Surgery Which of the following is best for diagnosis of pheochromocytoma? A 24-hour urinary Vaniyll Mandelic acid B 24-hour urinary Fractionated Metanephrine C 24-hour Urinary Hydroxy indole acetic acid D 24-hour Urinary Hydroxy tryptamine 💡 Explanation Which of the following is best for diagnosis of pheochromocytoma? ✓ Correct Answer: B. 24-hour urinary Fractionated Metanephrine