👉 Renal is a term used in medicine to describe the process by which the kidneys filter and remove waste products from the blood. It refers to the organs that are responsible for filtering out excess substances such as sodium, potassium, chloride, phosphate, bicarbonate, urea, creatinine, and other substances from the blood. Renal function is a measure of how well the kidneys work in removing waste products from the blood. A healthy kidney can filter out most harmful substances from the body's blood,