A normal post-void residual (PVR) is generally under 50 mL. Volumes of 50–100 mL may be acceptable in older adults, but consistently over 100 mL often indicates incomplete bladder emptying or urinary retention and warrants further evaluation. PVR is measured by bladder ultrasound or catheterization; interpretation should consider symptoms, age, and clinical context.

If post‑void residual (PVR) is high, the bladder isn’t emptying fully, raising risks of urinary tract infections, bladder stones, overflow incontinence and hydronephrosis that can damage kidneys. Causes include bladder outlet obstruction (eg, BPH), weak detrusor muscle or neurogenic bladder. Symptoms include weak stream, frequency, urgency and dribbling. Treatment aims to relieve obstruction, improve emptying (catheterization, medications or surgery) and prevent complications.

A PVR ultrasound measures post-void residual urine—the amount left in the bladder after urination. It’s a quick, noninvasive scan using an external ultrasound probe or bladder scanner. Clinicians use it to evaluate urinary retention, incontinence, recurrent UTIs or to monitor after surgery. Normal PVR is usually less than 50–100 mL; higher volumes may indicate impaired bladder emptying.

Treating high post-void residual (PVR) begins with assessment using a bladder scan and addressing the cause. Acute retention requires immediate catheterization. Chronic high PVR management includes clean intermittent self-catheterization, timed voiding/bladder training, pelvic floor therapy, treating infections, stopping or adjusting medications that cause retention, and medical or surgical relief of obstruction. Refer to urology for persistent symptoms, recurrent UTIs, or renal impairment.

Yes. A urinary tract infection can lead to increased post-void residual (PVR) by causing bladder inflammation, pain, detrusor (bladder muscle) dysfunction or temporary outlet blockage, producing incomplete emptying. Conversely, chronically high PVR raises UTI risk. Evaluation with bladder scan, urine testing and timely treatment or urology follow-up is recommended to identify and manage underlying causes.

When PVR is low, blood vessels are dilated, lowering afterload and blood pressure. Cardiac output may rise initially, but inadequate vascular tone can cause hypotension, dizziness, fainting and poor organ perfusion; compensatory tachycardia occurs. Severe, sustained low PVR (as in sepsis or anaphylaxis) can lead to shock and organ failure, requiring prompt medical treatment.