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.
Both GFR and CCr may be accurately calculated by comparative measurements of substances in the blood and urine, or estimated by formulas using just a blood test result (eGFR and eCCr). The results of these tests are used to assess the excretory function of the kidneys.