Which observation would most strongly indicate infection risk in this patient?

• A. Fever
• B. Weight gain
• C. Stable vitals
• D. Normal white blood cell count

Answer: (A)

Fever is the clearest signal that the body is fighting an infection. A rise in body temperature happens when pyrogens—substances from pathogens or inflammatory cells—act on the hypothalamus to raise the body’s set point. This systemic response is a key clue that an infection may be present or imminent, especially in a patient who may be at higher risk due to immunosuppression or recent procedures. Inflammatory bowel disease patients can be particularly vigilant for infections because symptoms can overlap with disease flares, but fever specifically points toward an infectious process rather than a noninfectious issue.

Weight gain doesn’t usually point to infection; it can reflect fluid retention, dietary changes, or other noninfectious factors. Stable vitals suggest there isn’t active hemodynamic instability or sepsis at that moment, although fever can occur early or in less dramatic presentations. A normal white blood cell count doesn’t rule out infection—some infections, especially viral ones or in immunocompromised individuals, may present with a normal or only mildly elevated WBC.