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What is A 22 year old man presents with history of bleeding from gums for the last 6 months. On investigation the b was found to be 8.2 gm% TLC 4400/mm, DLC N 64%, L 27%, E 3%, M 6% and platelet count of 20,000 /cu mm. Which one of the following investigation would be most useful in establishing the diagnosis - and explain in detail?
None