This single-center, prospective, observational study was performed in ICU of Guangdong Provincial People’s Hospital from July 2018 to January 2020. The inclusion criteria were applied: age ≥18 years, receiving teicoplanin (Targocid, Sanofi Co, Guangdong, China) intravenously, diagnosed or suspected clinically with Gram-positive infections. Exclusion criteria were patients who lacked any of the demographic and laboratory data described below. Demographic and clinical characteristics were collected including age, sex, body weight, serum creatinine concentrations (Scr), serum albumin concentrations (ALB). Creatinine clearance (Ccr) was calculated by the Cockcroft-Gault formula. The estimated glomerular filtration rate (eGFR) was calculated by CKD-EPI (Chronic Kidney Disease Epidemiology Collaboration) equation.20 (link) In addition, other clinical information including teicoplanin doses and dosing intervals, each time point of sample collection, the continuous renal replacement therapy (CRRT) status, baseline acute physiology and chronic health evaluation (APACHE) II scores were also recorded.