Plasma cystatin C and estimates of glomerular filtration rate using cystatin C independently diagnosed acute kidney injury in critically ill patients with sepsis

Introduction: Plasma Cystatin C (CysC) is as an early functional marker for acute kidney injury. Estimates of glomerular filtration rate using CysC (eGFRCysC) has been used in some clinical setting. We evaluated the utility of CysC and eGFRCysC in diagnosing AKI and predicting death in critically ill patients with sepsis. Methods: This is an interim analysis of single centre, prospective observational study of critically ill patients. Inclusion criteria were patients older than 18 years old with sepsis and procalcitonin > 0.5ng/ml. Plasma creatinine and CysC were measured on admission, and eGFRCysC was calculated. AKI was defined based on the plasma creatinine criteria of the KDIGO guideline. Results: Thirty one patients were recruited so far, of which 13 (41.9%) had AKI and six died. CysC were higher in patients with AKI versus No AKI (p