Objective: To measure the maximum urine flow rate and the average urine flow rate of uroflowmetry in pregnant women without lower urinary tract symptoms (LUTS) and study the differences of uroflowmetric parameters in each trimester.

Materials and Methods: One hundred forty-eight asymptomatic pregnant women were recruited and categorized into three trimesters, first, second, and third trimesters, respectively. All participants completed a validated Thai version of the urogenital distress inventory (UDI) and incontinence impact questionnaires to confirm that they have no LUTS. Uroflowmetry was performed on an outpatient basis.

Results: The mean age women was 29.28±5.29 years. The mean±SD of maximum urine flow rate in the first, second, and third trimesters were 18.85±6.10, 23.49±7.87, and 25.60±9.85 ml per second, respectively. The average urine flow rate in the first, second, and third trimesters were 10.06±2.81, 12.48±4.60, and 11.82±4.15 ml per second, respectively. The tenth percentile of the maximum flow rate were 12.38, 13.40, and 13.08 ml per second, respectively. There were statistical differences of the maximum urine flow rate and average urine flow rate among the first, second, and third trimesters.

Conclusion: The present study shows the uroflowmetric parameters in Thai pregnant women without LUTS. The maximum urine flow rate and the tenth percentile value can be used as the guide for further investigation.

Keywords: Uroflowmetry, Pregnancy, Lower urinary tract symptoms

Received 3 Oct 2016 | Revised 24 Dec 2016 | Accepted 27 Dec 2016