Kidney Function Blood Test Results. A gfr of 60 or higher is in the normal range. Tests to measure kidney function damage and detect abnormalities.
It can be calculated estimated by a formula using serum blood creatinine level patient s weight and age. Three positive results over three months or more is a sign of kidney disease. These tests are generally used to gauge how well your kidneys are working.
Gfr is a measure of how well your kidneys filter blood.
The bun or blood urea nitrogen test is another way to determine if the kidneys are successfully filtering the blood. The formula is 140 minus the patient s age in years times their weight in kilograms times 0 85 for women divided by 72 times the serum creatinine level in mg dl. A gfr of 15 or lower may mean kidney failure. This is often calculated by computer and reported with the creatinine blood test.