Which diagnostic tool is used to identify children who may have an infection or inflammatory process?

A. Arterial blood gas analysis evaluates oxygenation, ventilation, and acid-base balance, but it does not indicate infection or inflammation. B. Gastric lavage is used to remove ingested substances from the stomach, not to detect infection or inflammatory processes. C. Erythrocyte sedimentation rate (ESR) is a nonspecific test that measures the rate at which red blood cells settle in a tube over a specific time. An elevated ESR can indicate the presence of inflammation or infection in the body. D. Blood cultures are used to identify the specific pathogen causing an infection but do not measure the general presence of an inflammatory process.