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</div><div><span>Uroflowmetry</span></div></div>
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</noscript></div><div class="main"><div id="ency_summary"><p>Uroflowmetry is a test that measures the volume of urine released from the body, the speed with which it is released, and how long the release takes.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>You will urinate in a urinal or toilet fitted with a machine that has a measuring device.</p><p>You will be asked to begin urinating after the machine has started. When you finish, the machine will make a report for your health care provider.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How to Prepare for the Test</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Your provider may ask you to temporarily stop taking medicines that can affect the test results.</p><p>Uroflowmetry is best done when you have a full bladder. Do not urinate for at least 2 hours before the test. Drink extra fluids so you will have plenty of urine for the test. The test is the most accurate if you urinate at least 5 ounces (150 milliliters) or more.</p><p>Do not place any toilet tissue in the test machine.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>How the Test will Feel</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>The test involves normal urination, so you should not experience any discomfort.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Why the Test is Performed</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>This test is useful in evaluating the function of the urinary tract. In most cases, a person having this test will report urination that is too slow.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Normal Results</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Normal values vary depending on age and sex. In men, urine flow declines with age. Women have less change with age.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What Abnormal Results Mean</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Results are compared with your symptoms and physical exam. A result that may need treatment in one person may not need treatment in another person.</p><p>Several circular muscles around the urethra normally regulate urine flow. If any of these muscles becomes weak or stops working, you may have an increase in urine flow or <a test="test" href="./000891.htm">urinary incontinence</a>.</p><p>If there is a <a test="test" href="./002238.htm">bladder outlet obstruction</a> or if the bladder muscle is weak, you may have a decrease in urine flow. The amount of urine that remains in your bladder after urinating can be measured with ultrasound. </p><p>Your provider should explain and discuss any abnormal results with you.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Risks</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>There are no risks with this test.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Uroflow</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/10010t.jpg" alt="Urine sample" title="Urine sample" class="side-img"/><a href="../imagepages/10010.htm">Urine sample</a></li>
</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Brucker BM, Nitti VW. Urodynamic and video-urodynamic evaluation of the lower urinary tract. In: Partin AW, Domochowski RR, Kavoussi LR, Peters CA, eds. <em>Campbell-Walsh-Wein Urology. </em>12th ed. Philadelphia, PA: Elsevier; 2021:chap 114.</p><p>Capogrosso P, Salonia A, Montorsi F. Evaluation and nonsurgical management of benign prostatic hypoplasia. In: Partin AW, Domochowski RR, Kavoussi LR, Peters CA, eds. <em>Campbell-Walsh-Wein Urology.</em> 12th ed. Philadelphia, PA: Elsevier; 2021:chap 145.</p><p>Pessoa R, Kim FJ. Urodynamics and voiding dysfunction. In: Harken AH, Moore EE, eds. <em>Abernathy's Surgical Secrets.</em> 7th ed. Philadelphia, PA: Elsevier; 2018:chap 103.</p><p>Rosenman AE. Pelvic floor disorders: pelvic organ prolapse, urinary incontinence, and pelvic floor pain syndromes. In: Hacker NF, Gambone JC, Hobel CJ, eds. <em>Hacker &amp; Moore's Essentials of Obstetrics and Gynecology.</em> 6th ed. Philadelphia, PA: Elsevier; 2016:chap 23.</p></div></div></section>
<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 1/1/2023</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Kelly L. Stratton, MD, FACS, Associate Professor, Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City, OK. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.</p>
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