To assess the clinical value of urinary trypsin inhibitory activity (UTIA) in elderly people, a prospective study was carried out over 4 months in our internal medicine department. Two hundred and forty-three patients of more than 60 years of age were included. A positive correlation was observed between UTIA and serum creatinine (p<10−3).In the population with serum creatinine of less than 133μmol/l (200 patients), UTIA was independent of age, sex and serum creatinine. UTIA was compared with seven serum inflammatory proteins titrated on patient admission. The principal interest of UTIA determination appeared in bacterial infections. UTIA was significantly increased in this group (p<10−4). However, a positive correlation was proved only with C-reactive protein (CRP) (p=9×10−4). Nevertheless, CRP appeared to be the best marker of bacterial infectious diseases after receiver operating characteristic curves a
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