Have they been experiencing reduced urine output?
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How much has the patient voided in the past 24 hours?
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Less than 300 mL
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YES
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Anuria
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Dehydration
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NO
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YES
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NO
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Greater than 300 mL
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YES
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Oliguria
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Has the patient drunk enough fluids?
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Increase fluid intake and/or replace electrolytes
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NO
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Has the patient had a (recent) surgery?
(aortic cross clamping,
cardiopulmonary bypass, anesthesia)
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YES
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Does the patient have any pre-existing medical conditions?
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NO
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Has the patient been vomiting, experiencing blood loss, had a burn, or had an operation in which there was inadequate fluid replacement?
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YES
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Dehydration and/or hypovolaemia
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YES
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YES
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YES
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YES
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Decrease in renal perfusion
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Does the patient have a liver or adrenal condition?
(decompensated cirrhosis, hepatorenal syndrome, adrenal disease)
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Does the patient have a cardiovascular condition?
( Heart failure, cardiac tamponade, cardiogenic shock, pulmonary
hypertension, massive pulmonary embolism)
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Is the patient in pain?
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YES
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YES
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YES
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YES
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YES
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Decrease in renal perfusion
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Is the pain in the back? Does the pain start in the back and move to the front? Is the pain on passing urine?
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Is the pain
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Oliguria
