[The significance of body temperature, sedimentation, C-reactive protein, leukocyte count and differential for the diagnosis of infections in an internal medicine emergency department].

The value of body temperature, erythrocyte sedimentation rate (ESR), C-reactive protein, white blood cell count and differentiation for the diagnosis of infections in patients in the first aid department of internal medicine, was investigated. Forty-six infections were observed in 260 patients (prevalence 18%). Patients with fever had a fourfold increased chance to have an infection. In a patient with fever and an increased ESR the chance to have an infection was 91%, with fever and a normal ESR 33%. In the absence of fever the chance to have an infection was 14% if the ESR was increased and 7% if normal. White blood cell count and differentiation, like C-reactive protein in addition to body temperature were of no use for the diagnosis of infections.