Kidney Failure Fourth Stage. The stages of kidney disease are based on how well the kidneys can filter waste and extra fluid out of the blood. Stage 3b means kidney function is between 30 and 44 percent.
Stages are determined through certain tests performed by your doctor including a test used to calculate estimated glomerular filtration rate egfr which measures how well your kidneys are cleaning your blood. Stage 3b means kidney function is between 30 and 44 percent. Stage 5 is kidney failure.
In the early stages of kidney disease your kidneys are still able to filter out waste from your blood.
Stage 3a means your kidney is functioning between 45 and 59 percent. At stage 4 severe kidney damage has happened. The stages of kidney disease are based on how well the kidneys can filter waste and extra fluid out of the blood. Chronic kidney disease ckd is divided into 5 stages based on the level of kidney function.