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JOURNAL OF ULTRASOUND IN MEDICINE, vol.25, no.7, pp.831-834, 2006 (SCI-Expanded)
Objective. The purpose of this study was to evaluate the effect of premicturitional bladder volume (V-1) on postvoid residual urine volume (V-2) measurements and to assess the ideal V-1 for an accurate V-2 determination. Methods. Twenty-five healthy men without any urinary symptoms constituted the study group. Measurements by transabdominal ultrasonography for V-1 and V-2 were performed for each subject at 3 different phases, each of which was preceded by oral intake of 1000 mL of water and accompanied by "mild," "moderate," and "severe" sensations of micturition, respectively. Results. Mean +/- SD V-1 and V-2 during the first, second, and third phases were 117.7 +/- 70.3 and 1 +/- 1, 356.2 +/- 112.3 and 11.5 +/- 12 and 639.6 +/- 171.8 and 58.8 +/- 35.2 mL, respectively With 50 mL as the cutoff value for a pathologic V-2, 15 (60%) men had V-2 in the third phase exceeding this value, whereas the same rate was calculated as 0% for either of the first 2 phases. No patient with V-1 of less than 540 mL had V-2 of greater than 50 mL. Conclusions. Postvoid residual urine volume measurements with an uncomfortably full bladder result in high false-positive postmicturitional residue values even in healthy young men. We strongly advise that V-1 measurements of the bladder be performed before V-2 measurements and that V-2 not be measured if V-1 is greater than 540 mL.