Final answer:
The GFR under stage 5 chronic kidney failure is less than 15 mL/min/1.73 m², indicating established kidney failure and the need for renal replacement therapy such as dialysis or a kidney transplant.
Step-by-step explanation:
In stage 5 chronic kidney failure, the Glomerular Filtration Rate (GFR) is < 15 mL/min/1.73 m². This stage is characterized as established kidney failure, which means there is a significant and usually irreversible decline in kidney function. Patients with stage 5 CKD typically require renal replacement therapy, which may include dialysis or a kidney transplant.
The GFR is a critical measure of kidney function, indicating how much plasma is filtered through the glomeruli each minute. In a healthy individual, the GFR can range between 90 to 140 mL/min in men and 80 to 125 mL/min in women. As kidney function deteriorates, the GFR decreases, reflecting the kidneys' diminished ability to filter and clean the blood.