Patients with diverticulitis will usually have elevated WBC, although patients with early and/or mild diverticulitis may have a normal WBC count. This result may also be blunted in the elderly or immunocompromised.
If you have a severe flare up and need Cipro and Flagyl, your WBC will usually change. Keep in mind that diverticulosis is not the same as inflammed diverticulitis. Good luck!