Decisional procalcitonin thresholds are not adapted to elderly patients admitted to the emergency room.

Context: Diagnosis of sepsis in elderly is challenging.Objectives: We investigated whether procalcitonin concentrations in elderly differed from values for the general population.Methods: Procalcitonin measurement was assessed prospectively in 307 apyretic patients ≥75 years visiting the emergency department.Results: Median age was 86 years [IQR81–90] and 222 (72%) were female. Procalcitonin concentration was 0.057 µg/L [0.040–0.092]; 99th percentile was 0.661 µg/L. Patients with procalcitonin concentrations above decisional thresholds had lower glomerular filtration rate and higher C-reactive protein concentrations. Conclusions: Baseline procalcitonin levels are increased in elderly. Elevated values are common and associated to low-grade inflammation and lower eGFR.