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Urinary measurements

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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A urinary catheter is mandatory for monitoring fluid resuscitation in the patient with major burns. Also, a urinary catheter should be considered in patients with perineal burns.

The urine output gives a ready index of tissue perfusion. There are volume targets which should be attained in the first 24 hours after a major burn:

  • adults: 0.5 mls per kilogram per hour
  • children (less than 30 kilograms): 1.0 mls per kilogram per hour

Thus, the typical output per hour for an adult would be between 30 and 50 mls per hour. In smaller children with larger burns, up to 2.0 mls/kg/hour would be expected.

Persistently high urine output may be indicative of excessive fluid resuscitation. Equally, oliguria is often the sequel of inadequate fluid resuscitation.

Urine with a dark red colour may indicate haemoglobinuria or myoglobinuria.


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