Urine Output
Also written as UOP.
By the KDIGO definition it is a rise in creatinine of at least 26.5 micromol/L (0.3 mg/dL) within 48 hours, or 1.5 times the baseline within 7 days, or urine output below 0.5 ml/kg/hour for 6 hours (pRIFLE and KDIGO grade the severity).
What our notes say
- By the KDIGO definition it is a rise in creatinine of at least 26.5 micromol/L (0.3 mg/dL) within 48 hours, or 1.5 times the baseline within 7 days, or urine output below 0.5 ml/kg/hour for 6 hours (pRIFLE and KDIGO grade the severity). (Paediatrics end of fourth year main exam: 1 July 2019, Paper One, 99 of 100 MCQs)
- Less potassium is filtered and secreted when the GFR falls and urine output drops (oliguria). (Paediatrics end of fourth year main exam: 1 July 2019, Paper One, 99 of 100 MCQs)
- *Answer:* Optimize preload reduction with intravenous loop diuretics and monitor urine output. (Pleural Effusion)
- Monitor the mother and fetus (vital signs, glucose, urine output, and fetal heart rate). (Junior Clerkship in Reproductive Health (MBOG 4200): end of year examination, 4 )
- Aggressive fluid resuscitation with Ringer's lactate, aiming for good urine output; monitor vitals, urea and electrolytes. (Internal Medicine CAT 1 (MBIM 6112), 2019/2020: gastroenterology and hepatology,)
- Perfusion signs (skin temperature and capillary refill, pulses, urine output) guide fluid and drug treatment more directly than respiratory rate. (Junior Clerkship in Internal Medicine (MBIM4100) main exam, Paper One: 31 Januar)
Study material on Urine Output
- Harrisons Pulmonary and Critical Care Medicine
- Davidson's Essentials of Medicine - 2nd
- Devendra K. Gupta, Krishna M. Goel - Hutchison’s Paediatrics. chdhe-Jaypee Brothers (2012)
- Acute kidney injury
- Acute kidney injury
- Liver Function Tests (LFTs) — Notes
- Approach to renal disease
- Fluid balance
- BABY NELSON PEADS
- Acute Kidney Injury
Practice questions on Urine Output
A 55-year-old hypertensive patient presents with swelling and decreased urine output. Labs: BUN 45 mg/dL, Creatinine 3.8 mg/dL, Na⁺ 134 mmol/L, K⁺ 5.2 mmol/L. Urine Na⁺ 500 mOsm/kg. What is the likely cause?
- Acute tubular necrosis
- Prerenal azotemia
- Postrenal obstruction
- Chronic kidney disease Correct
Answer: B. Low urine sodium (<20) and high urine osmolality (>500) indicate intact tubular function trying to conserve sodium and water.