Kidney Problems Blood Test. A blood test checks your gfr which tells how well your kidneys are filtering. Kidney function tests usually require a 24 hour urine sample and a blood test.
Urine tests can also detect whether the kidneys are leaking abnormal amounts of protein a sign of kidney damage. Blood and urine tests show how well the kidneys are doing their job and how quickly body wastes are being removed. Kidney problems do not develop overnight.
To check for protein in your urine called proteinuria your doctor may suggest a urine test.
Kidney function tests usually require a 24 hour urine sample and a blood test. Two tests are used to check for kidney disease. Too much albumin in your urine is an early sign of kidney damage. Urea nitrogen is normal in the blood at small levels but higher levels may indicate that the individual is experiencing kidney problems.