IL6 and bacterial urinary tract infection: In one study, IL-6 was the only biomarker that was elevated in patients with ASB when UTI occurred, and the sensitivity and specificity of IL-6 (critical value of 25 pg/mL) to differentiate between ASB and UTI were 57% and 80%, respectively, manifesting that urinary IL-6 is promising in the detection between ASB and symptomatic UTI in the elderly [15].