How should urinary output be measured accurately during a shift?

• A. Use a calibrated container and estimate totals at shift end
• B. Use a calibrated container, record at regular intervals
• C. Record only once per shift
• D. Do not record

Answer: (B)

Accurate urinary output depends on using a calibrated container and recording measurements at regular intervals. A calibrated container provides precise volume markings, so you’re not guessing the amount, which reduces errors that come from estimates. Recording the output at regular intervals—often hourly or per policy—captures fluctuations over the shift and allows you to sum the total accurately. If you only estimate at the end of the shift or record infrequently, small but meaningful changes can be missed, which could mask dehydration, overload, or kidney issues. Not recording output at all is unsafe because it obscures the patient’s fluid balance and can delay important clinical decisions.