This can cause problems with the way your kidneys work.

This may be done to see how well the kidneys are working.

These people's kidneys will work well enough for them to live normal lives.

Results of these tests give information on how well your kidneys are working.

A blood test can also help determine how well your kidneys are working.

Kidney also works to keep the water level in the body at its correct amounts.

Its level in the blood is an indicator of how well the kidneys are working.

The lab called to report that the patient's kidneys weren't working.

Her kidneys are working at only 9% efficiency and they're getting worse.

The kidneys may not work well, which could lead to kidney failure.