Renal threshold
Renal Threshold
The Renal Threshold (pronounced: /ˈriːnəl ˈθrɛʃoʊld/) is a medical term that refers to the concentration of a substance dissolved in the blood above which the kidneys begin to remove it into the urine.
Etymology
The term "Renal" is derived from the Latin word renes, meaning kidneys. "Threshold" comes from the Old English þrescold meaning "the point of entering".
Definition
The Renal Threshold is the plasma concentration of a specific substance at which the kidneys start to excrete that substance into the urine. This threshold varies for different substances. For example, the renal threshold for glucose is typically around 10 mmol/L. When blood glucose levels exceed this threshold, glucose begins to appear in the urine, a condition known as glycosuria.
Related Terms
- Glomerular Filtration Rate (GFR): This is the volume of fluid that the kidneys filter from the blood per unit time. It is an important measure of kidney function.
- Reabsorption: This is the process by which the kidneys recover water and solutes from the filtrate (urine) back into the blood.
- Secretion: This is the process by which the kidneys add additional unwanted substances to the urine from the blood.
- Glycosuria: This is a condition characterized by an excess of sugar (glucose) in the urine, typically associated with diabetes or kidney disease.
See Also
External links
- Medical encyclopedia article on Renal threshold
- Wikipedia's article - Renal threshold
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