CALCA and acute pyelonephritis: Another meta-analysis published in 2015 involving the use of PCT for thediagnosis of acute pyelonephritis in pediatric patients showed that PCT valuesgreater than or equal to 1.0ng/mL had better diagnostic performance (91%specificity) than values greater than or equal to 0.5ng/mL (76% specificity and86% sensitivity).(36)