Uroflowmetry
Nexam Pro User Manual
75
The letters between square brackets in the formulas refer to the corresponding
letters in Figure 4.2.
Void
The voiding function is reported as expressed by maximum flowrate together
with voided volume and post-void residual urine in the format:
VOID = Qmax/VV/VRU (Maximum flow/Volume Voided/Residual Volume)
Undetermined values are substituted by a hyphen -. when only the volume is
measured VOID = -/340/-.
Qmax
Qmax is the maximum measured value of the flow during micturition.
When a is present, the Qmax will be the flow at the Peak flow marker. When
no Peak flow marker is present and Flow markers are present, the peak flow
will be the flow at the second Flow marker.
Calculated: Qmax = [F]
Time to Qmax
The time to Qmax is the elapsed time from the onset of the flow to the Qmax.
Calculated: Time to Qmax = [C]
Voided volume
The voided volume is the total volume expelled via the urethra.
Calculated: Voided volume = [E1+E2+E3+E4]
Flow time
The flow time is the time over which measurable flow actually occurs.
Calculated: Flow time = [B1+B2+B3+B4]
Voiding time
The voiding time is the total duration of micturition, including the miction
interruptions. When voiding is completed without interruptions, voiding time is
equal to flow time.
Calculated: Voiding time = [D]
Hesitancy
The hesitancy is the time from the moment the investigation is started until the
patient started voiding.
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