Does anyone know what a normal white blood cell count is for an older man?

My father is 76 and he has been feeling ill for a few weeks..Last week they told him they thought it was a bacterial infection and gave him antibiotics...This week his blood cell count has not changed and now they are sending him to a blood specialist..I am afraid that it is leukemia but I can't find what a normal blood cell count is..Please help me if you know...Thanks so much...
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I'm not sure, because I'm not a doctor.

BUT, when my mom was in the ICU, she was up between 13 -18. Which apparently is not good at all.

I was always told that anything below 8 was good. However, she had a brain injury and was in the ICU, so that might be "good" for her condition, considering where she was at.

I wish you the best of luck.