The test looks for albumin which is a protein found in our urine. A healthy kidney does not allow albumin to pass through urine while a damaged kidney would pass albumin into the urine. So if you have albumin in your urine this could be because you have kidney disease.
The blood test for kidney disease is called a GFR which stands for Glomerular Filtration rate which helps the doctor to measure the amount of blood which the kidney filters in a minute and indicates how well the kidneys are working. GFR is a number. Usually when the GFR goes below 60, then it indicates that you might be having kidney disease. But other information would also be needed since GFR tends to decrease as a person ages.
This is done by conducting blood tests and urine tests. In case you have diabetes, high BP, cardiovascular ailments or a family history of kidney diseases, ten you should have periodic checkups done to monitor kidney function.
For most people, there are no symptoms for early kidney disease and you would feel alright until-until the kidney almost stops working. It is for this reason that the kidney disease is also called a silent disease. Conducting blood tests and urine tests are the only manner in which kidney function can be checked.
Kidney disease can often be caused because of diabetes or high blood pressure. Our kidney has millions of tiny filter made by blood vessels which could get damaged due to diabetes or high blood pressure, lowering the ability of the kidney to filter the blood as well as they did earlier. As more of the filters get damaged, the kidney would stop working.