Urine flow rate

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Urine flow rate or urinary flow rate is the volumetric flow rate of urine during urination. It is a measure of the quantity of urine excreted in a specified period of time (per second or per minute). It is measured with uroflowmetry, a type of flow measurement.

The letters "V" (for volume) and "Q" (a conventional symbol for flow rate) are both used as a symbol for urine flow rate. The V often has a dot (overdot), that is, V̇ ("V-dot"). Qmax indicates the maximum flow rate. Qmax is used as an indicator for the diagnosis of enlarged prostate. A lower Qmax may indicate that the enlarged prostate puts pressure on the urethra, partially occluding it.

Uroflowmetry is performed by urinating into a special urinal, toilet, or disposable device that has a measuring device built in.[1] The average rate changes with age.[1]

Clinical usage

Changes in the urine flow rate can be indicative of kidney, prostate or other renal disorders. Similarly, by measuring urine flow rate, it is possible to calculate the clearance of metabolites that are used as clinical markers for disease.

The urinary flow rate in males with

urodynamics, males with this condition showed an improvement of 1.23 ml/s in the sitting position. Healthy, young males were not influenced by changing voiding position.[2]

See also

  • Urodynamics

References

  1. ^ a b "MedlinePlus Medical Encyclopedia: Uroflowmetry". From MedlinePlus, a service by the National Institutes of Health. Updated by: David C. Dugdale. Also reviewed by David Zieve. Update Date: 9/3/2010. Retrieved 2012-10-03.
  2. PMID 25051345
    .
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