Chronic kidney disease stage 3 is a moderate stage of chronic kidney disease where the glomerular filtration rate indicates 40 to 59 percent of kidney function, according to the National Kidney Center. GFR is the rate at which the kidneys filter waste.
Chronic kidney disease is a progressive disease and is classified by nephrologists into five stages, depending on the severity of the disease. Stage 1 is the mildest form of the disease where there are signs of kidney disease, but the GFR shows more than 90 percent of normal kidney function. In stage 2 kidney disease, the GFR indicates 60 to 89 percent of normal kidney function, states the National Kidney Center.
Stage 3 chronic kidney disease is moderate kidney disease, with only 40 to 59 percent of normal kidney function. A person who has stage 3 chronic kidney disease may experience no symptoms at all. He may also experience symptoms such as tiredness, back pain, puffiness or swelling, changes in appetite, changes in urine, high blood pressure, or slow digestion, according to the National Kidney Center.
In stage 4 chronic kidney disease, there is severe kidney disease, with only 15 to 29 percent of normal kidney function, reports the National Kidney Center. Stage 5 is end-stage kidney disease, where kidney function is less than 15 percent of normal.