What is a likely estimated glomerular filtration rate (eGFR) for a patient whose kidneys have lost most of their waste removal ability?

The estimated glomerular filtration rate (eGFR) is a key indicator of kidney function, measuring how well the kidneys are filtering waste from the blood. A normal eGFR is typically above 90 mL/min/1.73 m².

When a patient's kidneys have lost most of their waste removal ability, it indicates a significant reduction in kidney function. An eGFR of less than 15 mL/min/1.73 m² represents end-stage renal disease (ESRD) or kidney failure, where the kidneys are functioning at a critically low level. At this stage, the kidneys are unable to effectively filter out waste products, leading to a buildup of toxins in the blood.

Therefore, an eGFR of less than 15 mL/min/1.73 m² is consistent with the description given in the question, indicating severe impairment of the kidneys' ability to remove waste and maintain fluid and electrolyte balance. This gives healthcare providers essential information regarding the urgency and type of intervention needed, which could include dialysis or kidney transplantation.