Confit refers to a particular preparation of a food, usually a meat like duck, preserved by being salted and cooked slowly in its own fat. It can also be also a condiment made from fruit or vegetables cooked to the consistency of jam. Common non-meat confit foods, include garlic or lemons, cooked and preserved in a fat like oil or lard. A specialty of Gascony, France, the cooked meat used for confit is packed into a pot or crock and covered with fat.
Glomerular filtration rate (GFR) is a measure of the function of the kidneys. This test measures the level of creatinine in the blood and uses the result in a formula to calculate a number that reflects how well the kidneys are functioning, called the estimated GFR or eGFR.
The test measures how much creatinine is in the blood. This shows how well the kidneys are performing. In a normal healthy person the GFR stays close to the same value all of the time. The test is done by taking blood from a person and sending it to a laboratory. Normal values are between 90ml/min and 110ml/min.