Osmotic diuresis is increased urination due to the presence of certain substances in the fluid filtered by the kidneys. This fluid eventually becomes urine. The process of osmosis created by these substances cause additional water to come into the urine, increasing its amount.
Osmotic diuresis can be caused by:
- High blood sugar (glucose)
- Use of certain medicines, such as Mannitol
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Pfennig CL, Slovis CM. Electrolyte disorders. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 117.