Bladder Post Void Residual Volume

Article Author:
Levi Ballstaedt

Article Editor:
Blair Woodbury

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Sandeep Sekhon

3/31/2019 1:38:48 PM


Post-void residual volume (PVR) is the amount of urine retained in the bladder after a voluntary void and functions as a diagnostic tool. A post-void residual volume helps in the evaluation of many disease processes, including but not limited to neurogenic bladder, cauda equina syndrome, urinary outlet obstruction, mechanical obstruction, medication-induced urinary retention, postoperative urinary retention, and urinary tract infections. Evaluating for post-void residual is typically performed using ultrasound, a bladder scanner, or with a urinary catheter.

Specimen Collection

A urine specimen is not always indicated but can aid in the diagnostic evaluation, especially if there is a concern for infection as the etiology of the elevated residual volume.  Urinary catheterization after voiding can provide both a post-void residual and a urine specimen. Urinary catheterization should be performed sterilely to prevent infection and to obtain an uncontaminated urine specimen. See below for urinary catheterization technique.


Post-void residual evaluation is by measuring the remaining urine in the bladder shortly after a voluntary void; this can be accomplished through ultrasound, bladder scan, or by directly measuring the urine volume drained by a urinary catheter.  Urinary catheterization is the gold standard for measuring the post-void residual.[1]

Measurement of post-void residual immediately after voiding is crucial for accurate measurement, with delays of as little as 10 minutes from bladder emptying to post-void residual measurement potentially causing clinically significant overestimation of post-void residual.[2]

Ultrasound (conventional or real-time ultrasound)

The conventional ultrasound is used to visualize the bladder directly, either transabdominally or transvaginally. It measures the bladder’s volume using the ultrasound machine's internal volume calculations or the mathematical equation seen below. Transvaginal ultrasound appears especially accurate for measuring low bladder volumes.[3]


  • For transabdominal bladder volume evaluation, the probe is placed over the suprapubic area while the patient is in the prone position. Bladder images are recorded in both the sagittal and transverse planes. The greatest transverse (width), and anteroposterior (depth) and superior-inferior (height) distances are recorded.[4]
  • For transvaginal bladder volume evaluation, an intracavitary transvaginal probe with frequencies between 7 to 9 MHz is used. Ensure the probe is clean, has a probe cover, and has gel placed onto the end of the probe. Patient position is supine with the legs in stirrups or a pad under the pelvis. The probe is inserted into the vagina, and the bladder identification is in the sagittal plane. Measurements are from the longest anteroposterior dimension and the craniocaudal dimension. The probe is then rotated 90 degrees to measure the width or axial dimension.[5]

Most ultrasound machines have a function to automatically calculate volumes from the measurements used with the ultrasound calipers. If this function is not available the volumes can also be calculated using the prolate ellipsoid formula. Though there are multiple mathematical methods to calculate volume, the prolate ellipsoid is one accepted method, and the formula follows[6][7]:

  •  Volume = length x width x height x 0.52. (Note, the prolate ellipsoid formula has multiple acceptable correction factors.)

The bladder is measured at its maximal transverse (width), longitudinal (length) and anterior-posterior (height) diameters. This method is recommended as the standard calculation because it is fast and easy.[7]


Data on the accuracy of transabdominal ultrasound for determining post-void residual is mixed. Although most studies demonstrate high accuracy of post-void residual using transabdominal point-of-care ultrasound or bladder scanners with automated measurement of bladder volume,[8][9][10] other recent studies have brought their accuracy into question.[11][12]

The portable bladder ultrasound device (commonly known as a bladder scanner)

A portable bladder ultrasound device uses ultrasound to specifically measure the three-dimensional volume of urine in the bladder.  It is a non-invasive approach to identifying post-void residual.


The patient lies supine, ultrasound gel is to be placed at the suprapubic area, and the probe is then placed on the gel and directed toward the patient's bladder. The button is depressed, initiating the machine's evaluation of the bladder's volume, which is then displayed for the operator to see. The process can be repeated to better align the bladder in the center of the display. The largest volume is recorded.[8] Different bladder scanner machines may have slightly different procedures, but the basics of the technique are similar across devices.


Bladder scanning is not suitable for use on patients with severe abdominal scars, prolapses of the uterus, or current pregnancy. [13] Abdominal ascites appears to cause falsely elevated measurements in some cases.[14] There is some evidence that bladder scanners are more accurate than two-dimensional ultrasound imaging.[4]

Urethral Catheterization

Urethral catheterization directly measures the post-void residual and is considered the gold standard for determining post-void residual, although there may be variable volumes present after catheterization, depending on the size and type of catheter used for drainage.[14] 


The male and female anatomy requires different techniques with inserting a urethral catheter, but the overall procedure and sterile technique are similar. Perform hand hygiene and place the patient in position of accessibility; a female patient should be placed in the frog-leg position, sterile drapes should cover the genitals with the urethral meatus exposed. Don sterile gloves. The non-dominant hand should hold the penis at a 90-degree angle toward the ceiling, and for females, the labia should be separated and held to expose the urethral meatus. The urethral meatus and glans penis for males or perineum for females should undergo prepping with an antiseptic solution using sterile technique. Insert a well-lubricated catheter into the urethral meatus with the dominant, sterile-gloved hand, and observe for a spontaneous return of urine to confirm placement in the bladder. Once placement is confirmed, inflate the catheter balloon with sterile water or saline.[15] For in-out catheterization to obtain a post-void residual, allowing the bladder to drain completely into a graduated container and measure the volume, then remove the catheter; this should be performed shortly after a voluntary void to ensure an accurate post-void residual.


  • Common traumatic complications include urethral trauma, false passages created in the urethra, and inadvertent balloon inflation in the urethra.
  • The precursor of catheter-associated urinary tract infection is bacteria, which develops at an average rate of 3% to 10% per day of catheterization. The commonly studied incidence of infection relates to indwelling catheterization and not in-and-out catheterization, which would be used to identify a PVR or to obtain a sterile urine sample.  

Comparison of bladder scanner to urinary catheterization:

  • Ching-Hwa Teng et al. found no statistical difference in PVR when measured using the bladder scanner or urinary catheterization. Additionally, the average time to perform the bladder scan was 45 seconds, whereas the average time to perform the urinary catheterization was 293 seconds.[13]
  • Additionally, Christopher E. Kelly states that the portable bladder scanner is convenient, noninvasive, accurate, cost-effective and carries no risk of urethral trauma or urinary tract infection, and they are beneficial in a variety of populations including patients who have a neurologic disease, children and the elderly.[18]


A post-void residual measurement is a diagnostic tool used when there is a concern for underlying neurological disease/injury, bladder dysfunction, mechanical obstruction, infection or medication-induced urinary retention.

Symptoms of urinary retention and post-void residual can be indirect. A common presenting symptom of acute urinary retention is low abdominal pain and inability to pass urine,[19] although, in young children or patients with dementia, who provide limited history, agitation may be the only sign of bladder distension.

Patients with cauda equina syndrome may present with low back pain, saddle anesthesia, bilateral sciatica, motor weakness of the lower extremities, paraplegia, or incontinence.[20]

Young children may have urinary retention due to refusing to urinate because of the pain of urination caused by a UTI.

Potential Diagnosis

Underlying causes of elevated post-void residual include (but not limited to):


  • Cauda equina syndrome
  • Spinal nerve impingements (due to trauma, neoplasm, disc herniation, infection or hematoma)
  • Diabetic bladder neuropathy
  • Spinal cord injury
  • Cerebrovascular accident 
  • Traumatic brain injury 
  • Neurogenic bladder 
  • Fowler syndrome (inability to relax bladder sphincters) 
  • Vitamin B12 deficiency
  • Alcoholism
  • Multiple sclerosis 
  • Parkinson disease 
  • Bladder denervation from pelvic surgery injury
  • Heavy metal poisoning
  • Detrusor-sphincter dyssynergia
  • Post-surgical urinary retention 


  • Benign prostatic hypertrophy
  • Phimosis and paraphimosis
  • Prostate cancer
  • Ureteral calculi
  • Bladder calculi
  • Urethral strictures
  • Bladder neoplasm
  • Fecal impaction
  • Blood clots
  • Cystocele
  • Tumors
  • Detrusor underactivity


  • Anticholinergics
  • Antihistamines
  • Tricyclic antidepressants
  • Decongestants
  • Cyclobenzaprine
  • Diazepam
  • NSAIDs
  • Amphetamines
  • Opioids 

Infectious and/or inflammatory

  • Cystitis
  • Prostatitis
  • Herpes simplex
  • Herpes zoster
  • Local abscess
  • Vulvovaginitis
  • Young children with UTI may retain urine refusing to urinate because of pain


  • Hypospadias 


  • Large bladder diverticula
  • Vesicoureteral reflux (causing rapid bladder refilling after voiding)
  • Posterior urethral valves

Normal and Critical Findings

For both sexes, there is a lack of consensus about what constitutes a significantly elevated post-void residual volume, and there is conflicting data. See below for general normal post void residual values.[21][22]


  • Less than 50mL PVR is adequate bladder emptying
  • Over 200mL PVR indicates inadequate emptying


  • More than 20mL PVR is considered abnormal


  • 50-100 ml PVR is considered normal


  • PVR over 500 mL with other neurological findings appears to be highly predictive of cauda equina syndrome

Interfering Factors

Limitations and interfering factors include[1][7][31][9][4]:

  • A false positive rate of 9% for urinary retention when evaluating post-void residual with ultrasonography may be due to ovarian cysts, renal cysts, ascites, uterine myoma with cystic degeneration
  • No standard calculation for measuring bladder volume exists
  • Measurement modalities produce different bladder volumes


Urinary catheterization is the gold standard to measure post-void residual volume but has some limitations such as discomfort, low compliance, and risk of urinary tract infection or injury.[1] One study of post-op females found the overall prevalence of UTI after catheterization was 2.3%, but the risk of UTI rose the longer the catheter was in place.[32]

In cases of urinary obstruction relieved by catheterization, post-obstructive diuresis (typically in cases of over 1500 mL of retained urine) can cause hypovolemia and electrolyte abnormalities that may require admission for management.[33]

Patient Safety and Education

A post-void residual is a diagnostic tool to evaluate for underlying pathology.  

Bladder scanning and real-time transabdominal ultrasound is non-invasive and has no risk of ionizing radiation. Urethral catheterization carries some risks including, hematuria, urethral injury, discomfort, and infection.

Clinical Significance

Although there is no consensus of what defines an elevated post-void residual volume, the post-void residual, in addition to history and physical exam, can help identify and diagnose urinary retention, and therefore determine the proper management, and prevent further disability or death.

Neurological Injury

  • Cauda equina syndrome is a serious condition which, if not managed expeditiously, leaves many patients with long-term neurological deficits. Urinary retention is considered a late sign predictive of paralysis, insensate bladder and bowel, and loss of sexual function.[34]  One researcher found patients diagnosed with cauda equina with the sole findings of urinary retention and absent ankle reflexes with no other obvious neurological abnormalities.[23] 
  • Long-standing neurogenic bladder can lead to loss of bladder compliance and refractory urinary incontinence, pyelonephritis, and possible deterioration of renal function over time.[35]
  • Non-neurologic causes of large post-void residual can cause neurogenic bladder


  • Conflicting data exist, but one study of stroke patients found that a higher rate of UTIs developed in patients with a PVR over 100ml.[36]


  • One researcher found that 9.5% of admitted patients to a geriatric unit with acute renal failure had renal disease caused by obstructive uropathy.[37] 
  • Bladder outlet obstructions, namely benign prostatic hyperplasia, lead to deep changing of bladder structure and function and possibly bladder dysfunction.[38] 

  • Image 7166 Not availableImage 7166 Not available
    Contributed by Meghan K. Herbst, MD
Attributed To: Contributed by Meghan K. Herbst, MD

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Bladder Post Void Residual Volume - Questions

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In a healthy 33-year-old, what is the normal post-void bladder residual volume?

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A 20-year-old female is being evaluated after a traumatic motor vehicle accident. The patient is complaining of lower back pain and tingling in her legs. The patient is asked to urinate spontaneously, and she produces 150 ml of urine. After voiding, her bladder is scanned with a bladder scanner. Which of the following post-void residual volume would be abnormal in this patient?

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A 75-year-old male complains of increased urinary frequency but is only able to produce a small amount of urine each time he uses the bathroom. The ultrasound to evaluate his bladder shortly after he returns from the bathroom. His bladder measures 9.0 cm in the transverse plane, 8.0 cm in the longitudinal plane, and 7.0 cm in the anterior-posterior plane. What is his post-void residual volume?

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A 65-year-old male with a past medical history of benign prostatic hypertrophy presents to the emergency department after a motor vehicle accident. He is complaining of 8/10 lower back pain since the accident. On examination, he is hypertensive and slightly tachycardic. Perineum numbness and suprapubic tenderness with fullness are noted. A bladder scan obtained after spontaneous void revealed 450 mL of urine in the bladder. In addition to placing a Foley catheter, which of the following treatments is indicated?

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A 13-year-old female with developmental delay and chronic constipation presents with her mother, who states that the child has not been urinating as much as normal. She has been eating and drinking well. Physical exam shows a well-hydrated female with a distended lower abdomen, and the patient grimaces when the lower abdomen is palpated. During the examination, the patient motions to her mother that she has to use the bathroom. Her mother is unsure how much the patient was able to urinate. At this time, the patient’s bladder is to be evaluated. What would be an appropriate way to evaluate this patient’s bladder?

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Bladder Post Void Residual Volume - References


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