CALCA and infection: PCT was higher in non-survivors than survivors, in infected than non-infected patients, and in complicated than uncomplicated cases.PCT greater than 5 ng/ml had a sensitivity of 81.5% and a specificity of 45.3% in predicting infection.PCT greater than 10 ng/ml had a sensitivity of 72.2% and a specificity of 51% in discriminating non-survivors.