Assessment of LUTs: Frequency Volume Chart

 
  1. A urinary frequency–volume chart is used to help distinguish and diagnose:

    1. Frequency: high frequency with normal 24-hour volume suggests that the bladder capacity is diminished (the male bladder normally holds 300–600 mL urine comfortably).

    2. Polyuria: passing more urine than usual (up to 3 L of urine in 24 hours is normal).

    3. Nocturia: waking at night to urinate.

    4. Nocturnal polyuria: passing, at night, more than 35% of the 24-hour urine production.

What your patient needs to do:

  1. Record how much they drink (preferably in mL) in the ‘IN’ section 

  2. Each time they pass urine, measure the amount passed in the measuring jug and record it in the ’OUT’ section 

  3. Put a line on the chart at the time they go to bed so that the number of times urine has been passed during the night can be calculated

  4. If there is any leakage, the patient should mark the ‘WET’ box accordingly;
            +       For a small amount
            ++     For a medium amount
            +++   For a large amount

  5. The patient should bring their completed FVC with them to their next appointment for you to interpret