Medicine Best test for diagnosis of Carcinoid tumor: A 24 hour urinary 5H.I.A.A B 24 hour catecholamines C 24 hour vaniylmandelic acid levels D 24 hour metanephrine levels 💡 Explanation Best test for diagnosis of Carcinoid tumor: ✓ Correct Answer: A. 24 hour urinary 5H.I.A.A