My 4 yr old had a wbc count of 4700 and monocytes of 12.7 a month ago! a week age we retested and his wbc was 5000 and monocytes was 10.2! any ideas?

Stop worrying: White cell values (total and individual cell types) fluctuate tremendously even from hour to hour. Fifteen minute in a cold shower can raise the white count from 8000 to 20000. The reference ranges are set so that several percent of healthy folks must fall outside on either end. Only extreme deviations or the presence of abnormal cells are worth looking at.