Medicine Which of the following is a major criteria for diagnosis of poycythemia vera: A Presence of JAK-2 mutation B Low Erythropoetin levels C High Leucocyte Alkaline Phosphatase (TLAP score) D Thrombocytosis 💡 Explanation Which of the following is a major criteria for diagnosis of poycythemia vera: ✓ Correct Answer: A. Presence of JAK-2 mutation