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Original ArticleOpen Access
Uroflowmetry in Normal Thai Subjects
Suebnukanwattana T 
,
Lohsiriwat S ,
Chaikomin R ,
Tantiwongse A ,
Soontrapa S
,
Lohsiriwat S ,
Chaikomin R ,
Tantiwongse A ,
Soontrapa S Background and Objectives : Uroflowmetric parameters of urination may be influenced by
many factors including age, sex, voiding position, technique used and also anatomical and physiological
variations. A cross-sectional study was carried out to measure uroflowmetric parameters in normal
Thai subjects and to compare these parameters among different ages and genders. Correlations between
peak flow rate and other parameters were also studied.
Method : One hundred and forty healthy Thai subjects were studied. They were classified into
two groups. Group I comprised of 50 male and 50 female young adults aged 18-30 years. Group II
comprised of 20 male and 20 female pre-elderly aged 50-60 years. A Dantec Urodyn I ,000 uroflowmeter
was used. The residual urine measurement was performed using an ultrasonograph.
Result : The techniques revealed the following uroflowmetric parameters. In the young
adults, the mean with standard deviation of the peak flow rate was 31.2 ± 9.0 ml!sec, mean flow rate
22.6 ± 7.4 ml/sec, voiding time 24.7 ± 10.6 sec, and voided volume 376.9 ± 147.5 ml. In the pre-elderly
group, the peak tlow rate was 27.5 ± 9.2 ml/sec, mean flow rate 19.1 ± 6.2 ml/sec, voiding time 24.4 ±
8.5 sec, and voided volume 310.3 ± I 07.8 ml. The peak flow and mean flow rates were significantly
higher in the young adults (p < 0.05). The voided volume in the young was higher with similar voiding
time. The peak flow and mean flow rates in females were significantly higher than the males (32.5 ±
10.0 vs 27.8 ± 8.0 ml/sec, p < 0.05 and 23.5 ± 8.1 vs 19.8 ± 5.8 ml/sec, p < 0.05 respectively). Voided
volume and voiding time did not differ among both genders. The correlation between peak flow rate
and voided volume was significant (r = 0.382, p < 0.01) indicating that the higher the voided volume
the higher the peak flow rate. Residual urine was less than 50 ml in all subjects indicating that these
subjects could void completely well. This study yielded normal uroflowmetric parameters in Thai
young adult and pre-elderly subjects without urological symptoms. These parameters vary with age
and gender, and are useful for the investigations of bladder function in a urological clinic.
Key word : Uroflowmetry, Age, Gender
many factors including age, sex, voiding position, technique used and also anatomical and physiological
variations. A cross-sectional study was carried out to measure uroflowmetric parameters in normal
Thai subjects and to compare these parameters among different ages and genders. Correlations between
peak flow rate and other parameters were also studied.
Method : One hundred and forty healthy Thai subjects were studied. They were classified into
two groups. Group I comprised of 50 male and 50 female young adults aged 18-30 years. Group II
comprised of 20 male and 20 female pre-elderly aged 50-60 years. A Dantec Urodyn I ,000 uroflowmeter
was used. The residual urine measurement was performed using an ultrasonograph.
Result : The techniques revealed the following uroflowmetric parameters. In the young
adults, the mean with standard deviation of the peak flow rate was 31.2 ± 9.0 ml!sec, mean flow rate
22.6 ± 7.4 ml/sec, voiding time 24.7 ± 10.6 sec, and voided volume 376.9 ± 147.5 ml. In the pre-elderly
group, the peak tlow rate was 27.5 ± 9.2 ml/sec, mean flow rate 19.1 ± 6.2 ml/sec, voiding time 24.4 ±
8.5 sec, and voided volume 310.3 ± I 07.8 ml. The peak flow and mean flow rates were significantly
higher in the young adults (p < 0.05). The voided volume in the young was higher with similar voiding
time. The peak flow and mean flow rates in females were significantly higher than the males (32.5 ±
10.0 vs 27.8 ± 8.0 ml/sec, p < 0.05 and 23.5 ± 8.1 vs 19.8 ± 5.8 ml/sec, p < 0.05 respectively). Voided
volume and voiding time did not differ among both genders. The correlation between peak flow rate
and voided volume was significant (r = 0.382, p < 0.01) indicating that the higher the voided volume
the higher the peak flow rate. Residual urine was less than 50 ml in all subjects indicating that these
subjects could void completely well. This study yielded normal uroflowmetric parameters in Thai
young adult and pre-elderly subjects without urological symptoms. These parameters vary with age
and gender, and are useful for the investigations of bladder function in a urological clinic.
Key word : Uroflowmetry, Age, Gender
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