A nurse is assisting with the care of a client who has diverticulitis. The nurse notes the following provider prescriptions: a clear liquid diet as tolerated, check stools for occult blood, blood glucose checks every 4 hr, repeat CBC in AM, acetaminophen 650 mg PO every 6 hr PRN, administer IV 0.9 percent sodium chloride at 100 mL/hr, ondansetron 4 to 8 mg IV every 8 hr PRN, hydromorphone 0.5 mg IV every 2 hr PRN, and piperacillin/tazobactam 3.375 g IV STAT then every 6 hr. Which of the following findings should the nurse monitor to evaluate if the client's condition is improving, has not changed, or has declined?