What is the acceptable tolerance when recording urinary output from a container?

• A. Within plus/minus 5 ml.
• B. Within plus/minus 25 ml.
• C. Within plus/minus 100 ml.
• D. There is no tolerance.

Answer: (B)

Accurate recording of urinary output hinges on recognizing that small measurement errors are unavoidable in real-world care. You use a clean graduated container, read at eye level, and note the volume. The acceptable tolerance is plus or minus 25 milliliters, meaning the value you document can differ from the true amount by up to 25 ml. This range accounts for common sources of error like parallax when reading the meniscus, rounding to the nearest marked increment, and minor spills or splashes. It keeps data reliable for tracking a resident's fluid balance and kidney function without expecting impossible perfection in routine situations. A tolerance of only a few milliliters would be impractical, while a tolerance as large as 100 ml would obscure important changes in output.