{"id":4129,"date":"2021-09-10T08:00:00","date_gmt":"2021-09-10T01:00:00","guid":{"rendered":"https:\/\/drsoaraweeurology.com\/?p=4129"},"modified":"2026-05-18T09:51:32","modified_gmt":"2026-05-18T02:51:32","slug":"residual-urine-%e0%b8%9b%e0%b8%b1%e0%b8%aa%e0%b8%aa%e0%b8%b2%e0%b8%a7%e0%b8%b0%e0%b8%84%e0%b9%89%e0%b8%b2%e0%b8%87","status":"publish","type":"post","link":"https:\/\/drsoaraweeurology.com\/th\/2021\/09\/10\/residual-urine-why-we-measure\/","title":{"rendered":"Residual urine: \u0e17\u0e33\u0e44\u0e21\u0e40\u0e23\u0e32\u0e16\u0e36\u0e07\u0e15\u0e49\u0e2d\u0e07\u0e27\u0e31\u0e14\u0e1b\u0e31\u0e2a\u0e2a\u0e32\u0e27\u0e30\u0e04\u0e49\u0e32\u0e07?"},"content":{"rendered":"\n<div class=\"wp-block-columns coblocks-author-columns has-background is-layout-flex wp-container-core-columns-is-layout-52275889 wp-block-columns-is-layout-flex\" style=\"background-color:#8C8C971A;padding-top:2.5rem;padding-right:2.5rem;padding-bottom:2.5rem;padding-left:2.5rem\">\n<div 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Weerasopone \u2014 Board-Certified Urologist in Bangkok, Thailand\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Dr. Soarawee Weerasopone \u2014 Board-Certified Urologist in Bangkok, Thailand&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2023\/12\/New-Photo-2024.png?fit=800%2C800&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2023\/12\/New-Photo-2024.png?resize=800%2C800&#038;ssl=1\" alt=\"Best Urologist working in Chonburi and Cambodia\" class=\"wp-image-7037\" srcset=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2023\/12\/New-Photo-2024.png?w=800&amp;ssl=1 800w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2023\/12\/New-Photo-2024.png?resize=300%2C300&amp;ssl=1 300w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2023\/12\/New-Photo-2024.png?resize=150%2C150&amp;ssl=1 150w, 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<path d=\"M12 0C5.372 0 0 5.372 0 12s5.372 12 12 12 12-5.372 12-12S18.628 0 12 0zM7.369 4.378c.525 0 .947.431.947.947 0 .525-.422.947-.947.947-.525 0-.946-.422-.946-.947 0-.525.421-.947.946-.947zm-.722 3.038h1.444v10.041H6.647V7.416zm3.562 0h3.9c3.712 0 5.344 2.653 5.344 5.025 0 2.578-2.016 5.025-5.325 5.025h-3.919V7.416zm1.444 1.303v7.444h2.297c3.272 0 4.022-2.484 4.022-3.722 0-2.016-1.284-3.722-4.097-3.722h-2.222z\"\/>\n    <\/svg>\n  <\/a>\n  \n  <a href=\"https:\/\/scholar.google.com\/citations?user=lTgsRMUAAAAJ&#038;hl=en\" \n     target=\"_blank\" \n     rel=\"noopener\"\n     title=\"Google Scholar\"\n     aria-label=\"View Google Scholar Profile\"\n     style=\"text-decoration: none; color: #4285F4; transition: transform 0.2s; display: inline-block;\"\n     onmouseover=\"this.style.transform='scale(1.15)'\"\n     onmouseout=\"this.style.transform='scale(1)'\">\n    <svg width=\"28\" height=\"28\" viewBox=\"0 0 24 24\" fill=\"currentColor\">\n      <path d=\"M5.242 13.769L0.5 9.5 12 1l11.5 8.5-4.742 4.269C17.548 11.249 14.978 9.5 12 9.5c-2.977 0-5.548 1.748-6.758 4.269zM12 10a7 7 0 1 0 0 14 7 7 0 0 0 0-14z\"\/>\n    <\/svg>\n  <\/a>\n  \n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Patients at my urology office frequently ask: &#8220;Why does the doctor need us to do a residual urine (RU) measurement?&#8221; Abnormal urination can arise from many causes, and one important factor is the inability of the urinary bladder to completely empty after voiding \u2014 leading to urine stasis inside the bladder.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Urology center Bangkok hospital Thailand\u00a0<a href=\"https:\/\/www.bangkokhospital.com\/en\/bangkok\/doctor\/dr-soarawee-weerasopone-2\" target=\"_blank\" rel=\"noreferrer noopener\">Booking online<\/a>\u00a0<a href=\"tel:02-310-3009\">02-310-3009<\/a>\u00a0<a href=\"mailto:bhquro@bdms.co.th\">bhquro@bdms.co.th<\/a><\/li>\n\n\n\n<li>Samitivej Sriracha hospital Chonburi&nbsp;<a href=\"tel:088-022-1445\">088-022-1445<\/a><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"800\" height=\"533\" data-attachment-id=\"4141\" data-permalink=\"https:\/\/drsoaraweeurology.com\/th\/2021\/09\/10\/residual-urine-why-we-measure\/urethral-catheter-hold-on-blue-glove-hand-on-white-background-5\/\" data-orig-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?fit=1200%2C800&amp;ssl=1\" data-orig-size=\"1200,800\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;5.6&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;Canon EOS Kiss X2&quot;,&quot;caption&quot;:&quot;urethral catheter hold on blue glove hand on white background&quot;,&quot;created_timestamp&quot;:&quot;1567694652&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;60&quot;,&quot;iso&quot;:&quot;100&quot;,&quot;shutter_speed&quot;:&quot;0.005&quot;,&quot;title&quot;:&quot;urethral catheter hold on blue glove hand on white background&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"In the past, we do residual urine measurement by intermittent urethral catheterization which is quite too invasive.\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;In the past, we do residual urine measurement by intermittent urethral catheterization which is quite too invasive.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?fit=800%2C534&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?resize=800%2C533&#038;ssl=1\" alt=\"Residual urine catheter measurement\" class=\"wp-image-4141\" srcset=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?resize=1024%2C683&amp;ssl=1 1024w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?resize=768%2C512&amp;ssl=1 768w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Catheter.jpg?resize=18%2C12&amp;ssl=1 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">In the past, residual urine was measured by urethral catheterization \u2014 an invasive method now replaced by ultrasound.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Previously, RU measurement required inserting a urethral catheter after the patient finished voiding to measure the remaining volume in milliliters. Today, ultrasound has replaced this invasive method. The patient undergoes an initial ultrasound scan, then voids in the restroom, then has a repeat ultrasound to measure the remaining bladder volume. The radiologist reports RU in milliliters \u2014 the same unit as the old catheter method, but completely non-invasively.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" decoding=\"async\" width=\"800\" height=\"534\" data-attachment-id=\"4140\" data-permalink=\"https:\/\/drsoaraweeurology.com\/th\/2021\/09\/10\/residual-urine-why-we-measure\/man-is-standing-pee-in-a-toilet-healthcare-urinal-concept\/\" data-orig-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?fit=1200%2C801&amp;ssl=1\" data-orig-size=\"1200,801\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;4&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;NIKON D610&quot;,&quot;caption&quot;:&quot;Man is standing pee in a toilet - healthcare urinal concept&quot;,&quot;created_timestamp&quot;:&quot;1548491249&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;46&quot;,&quot;iso&quot;:&quot;2000&quot;,&quot;shutter_speed&quot;:&quot;0.033333333333333&quot;,&quot;title&quot;:&quot;Man is standing pee in a toilet - healthcare urinal concept&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"Now a day, residual urine measurement is done by ultrasonography which is a lot more convenience.\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Now a day, residual urine measurement is done by ultrasonography which is a lot more convenience.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?fit=800%2C534&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?resize=800%2C534&#038;ssl=1\" alt=\"Residual urine ultrasound measurement\" class=\"wp-image-4140\" srcset=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?resize=1024%2C684&amp;ssl=1 1024w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?resize=768%2C513&amp;ssl=1 768w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Void.jpg?resize=18%2C12&amp;ssl=1 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Today, residual urine measurement is done by ultrasound \u2014 convenient and non-invasive.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">The limitations of ultrasound-based RU measurement include: (1) Overestimation if not measured within 10 minutes of voiding, as the kidneys continuously produce urine; and (2) Operator dependency, as the radiologist must manually measure bladder dimensions to calculate volume.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/25251215\/\">Residual urine<\/a> normal values by age group<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Adults:<\/strong> RU &lt; 50 mL = adequate emptying; RU &gt; 200 mL = inadequate emptying<\/li>\n\n\n<li><strong>Children:<\/strong> RU &gt; 20 mL = inadequate emptying<\/li>\n\n\n<li><strong>Elderly:<\/strong> RU 50\u2013100 mL = normal emptying (age-related bladder changes allow higher thresholds)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"533\" data-attachment-id=\"4138\" data-permalink=\"https:\/\/drsoaraweeurology.com\/th\/2021\/09\/10\/residual-urine-why-we-measure\/in-hospital\/\" data-orig-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?fit=1200%2C800&amp;ssl=1\" data-orig-size=\"1200,800\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;2.8&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;Canon EOS 5D Mark III&quot;,&quot;caption&quot;:&quot;Cute girl and her mother looking at the doctor in hospital&quot;,&quot;created_timestamp&quot;:&quot;1366291380&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;85&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0.008&quot;,&quot;title&quot;:&quot;In hospital&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"Normal residual urine in children should less than 20 mL.\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Normal residual urine in children should less than 20 mL.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?fit=800%2C534&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?resize=800%2C533&#038;ssl=1\" alt=\"Residual urine children normal value\" class=\"wp-image-4138\" srcset=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?resize=300%2C200&amp;ssl=1 300w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?resize=1024%2C683&amp;ssl=1 1024w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?resize=768%2C512&amp;ssl=1 768w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Child-RU.jpg?resize=18%2C12&amp;ssl=1 18w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Normal residual urine in children should be less than 20 mL.<\/figcaption><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"607\" data-attachment-id=\"4139\" data-permalink=\"https:\/\/drsoaraweeurology.com\/th\/2021\/09\/10\/residual-urine-why-we-measure\/doctor-explain-test-result-for-elder-man-patient\/\" data-orig-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?fit=1200%2C911&amp;ssl=1\" data-orig-size=\"1200,911\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;4&quot;,&quot;credit&quot;:&quot;CHAMAIPORN.KITINA@GMAIL.COM&quot;,&quot;camera&quot;:&quot;NIKON D810&quot;,&quot;caption&quot;:&quot;Young caucasian doctor read and explaining consult medical test document for asian elder senior man while visit patient at home.healthcare and medical concept.&quot;,&quot;created_timestamp&quot;:&quot;1580048144&quot;,&quot;copyright&quot;:&quot;WWW.I-MAIPHOTOGRAPHER.COM&quot;,&quot;focal_length&quot;:&quot;60&quot;,&quot;iso&quot;:&quot;400&quot;,&quot;shutter_speed&quot;:&quot;0.003125&quot;,&quot;title&quot;:&quot;doctor explain test result for elder man patient.&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"Less than 100 mL Residual urine in elderly is considered as normal.\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Less than 100 mL Residual urine in elderly is considered as normal.&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?fit=800%2C607&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?resize=800%2C607&#038;ssl=1\" alt=\"Residual urine elderly normal value\" class=\"wp-image-4139\" srcset=\"https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?w=1200&amp;ssl=1 1200w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?resize=300%2C228&amp;ssl=1 300w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?resize=1024%2C777&amp;ssl=1 1024w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?resize=768%2C583&amp;ssl=1 768w, https:\/\/i0.wp.com\/drsoaraweeurology.com\/wp-content\/uploads\/2021\/09\/Elderly-RU.jpg?resize=16%2C12&amp;ssl=1 16w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption class=\"wp-element-caption\">Residual urine under 100 mL in the elderly is considered normal.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">When elevated RU is found, the causes must be thoroughly assessed \u2014 including neurogenic, mechanical (obstruction), medication-related, infectious, or inflammatory etiologies. Treatment is then individualized to each patient. RU &gt; 100 mL has been associated with an increased risk of urinary tract infection.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">You can visit my official homepage <a href=\"https:\/\/drsoaraweeurology.com\/\">here<\/a>!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions About Residual Urine Measurement<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">What is residual urine and why does the doctor measure it?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Residual urine (RU) is the volume of urine remaining in the bladder after voluntary voiding is complete. It is measured to assess bladder emptying efficiency. An elevated RU indicates that the bladder is failing to empty adequately, which can result from bladder outlet obstruction (e.g., BPH in men), neurogenic bladder dysfunction, detrusor underactivity, or medication side effects. RU measurement is a key diagnostic tool in the evaluation of lower urinary tract symptoms.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">What is the normal residual urine volume?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Normal values differ by age group: in adults, RU under 50 mL is considered adequate emptying, while over 200 mL indicates inadequate emptying. In children, RU should be under 20 mL. In the elderly, RU of 50\u2013100 mL is considered acceptable due to age-related changes in bladder contractility. RU above 100 mL in adults is associated with an elevated risk of urinary tract infection.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">How is residual urine measured today?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Residual urine is now measured non-invasively by bladder ultrasound. The patient undergoes an initial ultrasound scan, then voids in the restroom, and immediately has a repeat ultrasound to measure the remaining volume. This should ideally be done within 10 minutes of voiding to avoid overestimation from ongoing urine production. Bladder ultrasound has replaced the older method of urethral catheterization, which was invasive and uncomfortable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If you have concerns about incomplete bladder emptying, frequent urination, or urinary tract symptoms, Dr. Soarawee Weerasopone offers specialist consultations at Bangkok Hospital Headquarters. <a href=\"https:\/\/www.bangkokhospital.com\/en\/bangkok\/doctor\/dr-soarawee-weerasopone-2\">Book a Consultation<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Disclaimer:<\/strong> This content is written and reviewed by Dr. Soarawee Weerasopone, a board-certified urologist at Bangkok Hospital Headquarters. It is intended for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any medical treatment.<\/p>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is residual urine and why does the doctor measure it?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Residual urine (RU) is urine remaining in the bladder after voiding. It assesses bladder emptying efficiency. Elevated RU can result from BPH obstruction, neurogenic bladder, detrusor underactivity, or medication effects. It is a key diagnostic tool in lower urinary tract symptom evaluation.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the normal residual urine volume?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Adults: <50 mL adequate, >200 mL inadequate. Children: >20 mL inadequate. Elderly: 50-100 mL acceptable. RU >100 mL in adults raises UTI risk.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How is residual urine measured today?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Non-invasively by bladder ultrasound: initial scan, patient voids, repeat ultrasound within 10 minutes to measure remaining volume. This replaces the older invasive urethral catheterization method.\"\n      }\n    }\n  ]\n}\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Patients at my urology office frequently ask: &#8220;Why does the doctor need us to do a residual urine (RU) measurement?&#8221; Abnormal urination can arise from many causes, and one important factor is the inability of the urinary bladder to completely empty after voiding \u2014 leading to urine stasis inside the bladder. Previously, RU measurement required [&hellip;]<\/p>\n","protected":false},"author":185281453,"featured_media":10090,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"Residual urine (RU) measurement explained: normal values by age group, how ultrasound replaced catheterization, and causes of elevated RU. 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