1973 Volume 64 Issue 10 Pages 837-846
DISA-Uroflowmeter, a recently developed momentum mass flowmeter, was tested for its accuracy under various conditions. Up to the flow rate of 50ml/sec, the error deviating from the claimed steady flow lineality fell within the range of ±10%. When the stream was shifted from side to side, as in the case of physiological voiding, the application of conical funnel caused fluctuation of flow rate recordings. Thus at a flow rate up to 10ml/sec, the error fell in an extended range between -54.5% and +44.2%. At a flow rate of 10ml/sec or more, the error is somewhat reduced and detected as between -37.0% and +9.8%. The lag time of recording was determined as 0.2 second, and the time interval required for reaching the plateau value was 1.3 second.
In addition, the present paper is concerned with brief introduction of various available uroflowmeters, their accuracy, structural principles and some problems in clinical use. An emphasis is placed on the interpretation of errors arising from the form of urine collecting system, and the importance of skillfull management of any uroflowmeter including enough recognition of its charactaristics and precise correction of its accuracy.
