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Medicine
A patient presents with acute gastroenteritis in a dehydrated state. Which of the following conditions is highly suggestive of pre-renal renal failure?
Urinary sodium > 40 m mol; Urine osmolality <350m osm/L
Urinary sodium > 40 m mol; Urine osmolality > 500m osm/L
Urinary sodium < 20 m mol; Urine osmolality > 500m osm/L
Urinary sodium < 20 m mol; Urine osmolality < 350m osm/L
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