CXCL8 and bacterial urinary tract infection: In a cohort study of 16 catheterised in-patients,27 a threshold of 50pg IL-8 per ml of urine was associated with a sensitivity of 97.1% (95% CI 77.1-99.9) and a specificity of 85.3% (95% CI 62.3-95.3) for diagnosing UTI.