Bone marrow examination is very useful not only in the diagnosis of hematological disorders. Both bone marrow biopsy and aspiration findings were studied and findings are compared morphologically. The biopsy specimen is best for the architectural evaluation and its relation with pathologic marrow elements. Core biopsy is best for ancillary study like immunohistochemistry . The diagnoses of hematological disorders were mainly done by taking complete clinical history, careful physical examination, complete haemogram and bone marrow examination.