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Name of Symptom/Sign:
Classifications and external resources
ICD-10 R81.
ICD-9 791.5
DiseasesDB 5323
MeSH D006029

Glycosuria or glucosuria is an abnormal condition of osmotic diuresis due to excretion of glucose by the kidneys.

The most common cause of glycosuria is untreated diabetes mellitus. This disease raises plasma glucose levels far above normal, and beyond a certain threshold, the excess glucose is excreted by the kidneys, taking water with it and producing diuresis. The threshold varies somewhat from one individual to another, with values around 8.9 - 10 mmol/l (160 - 180 mg/dl)[1]. As a reference, the normal blood value of fasting glucose is around 3.9 - 5.8 mmol/l (70 - 105 mg/dl).

This point is called the renal threshold of glucose (RTG) [2]. Some people, especially children and pregnant women, may have a low RTG (less than ~7 mmol/L[2] glucose in blood to have glucosuria).

If the RTG is so low that even normal blood glucose levels produce the condition, it is referred to as renal glycosuria.


  1. ^ - Glucose - Medical Background
  2. ^ a b AIDA on-line' Explanations

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Glycosuria". A list of authors is available in Wikipedia.
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