What does having a white blood cell count of 41000 mean in a 65-year-old male especially if doctors are questioning leukemia?

Any illness with a significant raised WCC (white blood cell count) especially at an abnormal level like this, with other symptoms point to leukaemia. WCC, is raised in infection as well as inflammatory conditions, eg asrthritis. however, not as high as what would be seen in leukaemia