This document provides an overview of chronic kidney disease (CKD), including definitions, stages, methods for measuring glomerular filtration rate and proteinuria, risk factors for progression, complications, and management strategies. Key points covered include defining and staging CKD, estimating GFR using creatinine clearance and the MDRD equation, screening for and treating anemia, hypertension, hyperlipidemia, renal osteodystrophy, and acidosis, and preparing patients for end-stage renal disease with timely nephrology referrals and vascular access placement.