Thanks for posting you query to health care magic. this is not a normal condition as haemoglobin level is very low condition called as anaemia .what investigation your clinician want to do on bone marrow please send me .As bone marrow study for histopathology will help in finding cause if there is any abnormality in cells and microbiological examination of bone marrow will guide you about infective cuase for your anaemia . in my opinion if you are still having feverish illness you should be undergone blood investigation for 1.widal test 2. culture and sensitivity so that you can rule out infective cause . further if you are having only anaemia bone marrow histology will be enough for making diagnosis. but you should take treatment for anaemia iron supplements should be taken regularly and take god nutritious dite with higher amount of green leafy veg . hope you are satisfied with my answer . feel free to communicate if any query . regards, Dr.Manish Purohit Infectious disease specialist