Nocturia Assessment Using a 72-Hour Frequency Volume Chart

Components of a Standard 72-Hour Frequency Volume Chart

A 72-hour frequency volume chart is used to evaluate nocturia by recording the time and volume of each urination over three consecutive 24-hour periods to identify patterns of nocturnal polyuria and reduced bladder capacity, as recommended by the European Urology guidelines 1, 2
The chart should include time and volume recording, documenting the exact time and measured volume of each void throughout the day and night for 3 consecutive days, according to The Journal of Urology and European Urology guidelines 3, 4
Sleep/wake times should be noted to differentiate between daytime and nighttime voids, as suggested by the European Urology guidelines 5
An urgency sensation scale should be included to rate the level of urgency experienced before each void, as recommended by the European Urology guidelines 5
Incontinence episodes should be documented, as suggested by The Journal of Urology guidelines 6

Nocturnal urine volume should be calculated as the total volume of urine produced during sleep, as recommended by the European Urology guidelines 1

Patient education is crucial, providing clear written instructions on how to complete the chart accurately, as suggested by The Journal of Urology guidelines 6
The chart should be completed for the full 72 hours for reliable assessment, as recommended by The Journal of Urology guidelines 3
The completed chart should be used to guide treatment decisions and monitor progress, as suggested by the European Urology guidelines 1

Inaccurate volume measurement should be avoided by using proper measurement tools, as recommended by The Journal of Urology guidelines 3
Failure to distinguish sleep time from bed time should be avoided for accurate nocturnal polyuria assessment, as suggested by the European Urology guidelines 5
Not recording fluid intake should be avoided, as it is essential for identifying polydipsia as a potential cause, as recommended by The Journal of Urology guidelines 7