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ORIGINAL ARTICLE
Year : 2007  |  Volume : 23  |  Issue : 2  |  Page : 114-118

Clinical evaluation of a simple uroflowmeter for categorization of maximum urinary flow rate


1 Department of Urology, Freeman Hospital, Newcastle upon Tyne; School of Clinical and Laboratory Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
2 Department of Urology, Freeman Hospital, Newcastle upon Tyne, United Kingdom
3 School of Education, Durham University, Durham, United Kingdom
4 Department of Urology, Freeman Hospital, Newcastle upon Tyne; School of Surgical and Reproductive Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom

Correspondence Address:
Robert Pickard
Freeman Hospital, Newcastle upon Tyne, NE7 7DN
United Kingdom
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0970-1591.32058

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Objective: To evaluate the accuracy and diagnostic usefulness of a disposable flowmeter consisting of a plastic funnel with a spout divided into three chambers. Materials and Methods: Men with lower urinary tract symptoms (LUTS) voided sequentially into a standard flowmeter and the funnel device recording maximum flow rate (Q max ) and voided volume (V void ). The device was precalibrated such that filling of the bottom, middle and top chambers categorized maximum input flows as <10, 10-15 and > 15 ml s -1 respectively. Subjects who agreed to use the funnel device at home obtained readings of flow category and V void twice daily for seven days. Results: A single office reading in 46 men using the device showed good agreement with standard measurement of Q max for V void > 150 ml (Kappa = 0.68). All 14 men whose void reached the top chamber had standard Q max > 15 ml s -1 (PPV = 100%, NPV = 72%) whilst eight of 12 men whose void remained in the bottom chamber had standard Q max < 10 ml s -1 (PPV = 70%, NPV = 94%). During multiple home use by 14 men the device showed moderate repeatability (Kappa = 0.58) and correctly categorized Q max in comparison to standard measurement for 12 (87%) men. Conclusions: This study suggests that the device has sufficient accuracy and reliability for initial flow rate assessment in men with LUTS. The device can provide a single measurement or alternatively multiple home measurements to categorize men with Q max < 15 ml s -1 .


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