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Definition[edit | edit source]

Polyuria – a condition in which the daily diuresis is more than 2.5 liters. Polyuria is differentiated into osmotic and aqueous.

Classification[edit | edit source]

In osmotic polyuria, the patient excretes osmotically active substances, which, after a concentration gradient, "take" water with them. The urine is then hypertonic and its density is higher. Osmotic polyuria is often found in patients with diabetes mellitus or after taking diuretics.

Aqueous polyuria is caused, for example, by excessive fluid intake; in the absence of ADH, or when the receptors for ADH are defective. The urine is hypotonic, the density is lower. Water polyuria is often found in patients with diabetes insupidus.

Causes:[edit | edit source]

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References[edit | edit source]

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Source[edit | edit source]

  1. LEBL, Jan – PROVAZNÍK, Kamil – HEJCMANOVÁ, Ludmila, et al. Preklinická pediatrie. 2. edition. Praha : Galén, 2007. pp. 139-146. ISBN 978-80-7262-438-6.