Mon22November0925AM 2

Regarding acute tubular necrosis:

True / False

Shock is a cause Correct

The blood urea nitrogen/creatinine ratio is greater than 20 Correct

Urine specific gravity is greater than 1.01 Correct

Urine osmolality is greater than 500 milliosmoles per litre Incorrect answer selected

The urinary sodium is less than 20 mmol/L Correct

Explanation

Acute tubular necrosis (ATN) may be distinguished from prerenal conditions by the following:

blood urea nitrogen/creatinine ratio of 10-20

urine specific gravity less than 1.010

urine osmolality of less than 350 milliosmoles per kg (not per litre), and

a urinary sodium of greater than 40 millimoles per litre.

Shock is a cause of acute tubular necrosis.

The specific gravity refers to the density of a substance divided by that of water and a hydrometer is used to measure it. However osmolality is more clinically useful.

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