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

Lookup NU author(s): Dr Simon Pridgeon, Rob Pickard

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Abstract

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 (Qmax ) 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 Vvoid twice daily for seven days. Results: A single office reading in 46 men using the device showed good agreement with standard measurement of Qmax for Vvoid > 150 ml (Kappa = 0.68). All 14 men whose void reached the top chamber had standard Qmax > 15 ml s-1 (PPV = 100%, NPV = 72%) whilst eight of 12 men whose void remained in the bottom chamber had standard Qmax < 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 Qmax 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 Qmax < 15 ml s -1.

Publication metadata

Author(s): Pridgeon SW, Harding C, Newton D, Pickard RS

Publication type: Article

Publication status: Published

Journal: Indian Journal of Urology

Year: 2007

Volume: 23

Issue: 2

Pages: 114-118

Print publication date: 01/07/2007

ISSN (print): 0970-1591

ISSN (electronic): 1998-3824

URL: http://dx.doi.org/10.4103/0970-1591.32058

DOI: 10.4103/0970-1591.32058

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