Kidney Function Test Blood Work. A 24 hour urine sample is a creatinine clearance test. Urine test called acr.
If the blood test is abnormal it cannot say what is causing the kidney problem. Urine tests can also detect whether the kidneys are leaking abnormal amounts of protein a sign of kidney damage. At ucsf we use this very accurate blood test to assess kidney function and it can be obtained quickly right before a scan.
For ct egfr 45 indicates no increased risk of kidney damage from contrast material.
How your kidneys are checked. Controlling your blood pressure may help to protect your kidneys. Healthy kidneys remove wastes and excess fluid from the blood. It gives your doctor an idea of how much.