There is no express authority in the Constitution for judicial. review, and the argument in favor of the authority by implication, as. applied to national legislation, is far from conclusive. The argument for judicial review was formulated by Chief Justice.
But, if you don't drink much, your kidneys only produce a small amount of concentrated urine, keeping as much water as possible in your body. In 24 hours, your kidneys filter around 150 litres of blood and produce roughly 1.5 litres of urine.
The blood test, called GFR, measures how much blood your kidneys filter each minute. Your doctor uses this information to see how well your kidneys are working. A GFR of over 60 means your kidneys are working fine. A GFR of 60 or lower may mean you have kidney disease.