Glomerular filtration rate (GFR) is a measure of kidney function that quantifies the volume of blood filtered by the glomeruli per minute, typically expressed in millilitres per minute. It is crucial in assessing renal health, diagnosing chronic kidney disease, and determining the stage of kidney dysfunction. A key association is the use of GFR to guide medication dosing, as impaired renal function can lead to drug accumulation and toxicity, necessitating careful management.