I am 42 years old man. Suddenly my hemoglobin drop to 4.5.all blood test done .b12, iron normal. Wbc 11200. Mild leukocytosis. Reoccurring cough from past one month. What could be the reason for so less hemoglobin? I don't want to go for bone marrow test. Is there any other test which can help in diagnosing the problem.

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