Urodynamic Study
Measures bladder pressure — the number that predicts kidney risk.
What is Urodynamic Study?
Fine lines measure the pressure inside the bladder as it is slowly filled, showing how much it holds, how compliant it is, and at what pressure it leaks.
- Normal
- The problem
- Fluid or contrast
Why It Is Asked For
This test is requested only when the answer would change what we do next.
- Neurogenic bladder, most often with spina bifida or a spinal abnormality
- Persistent wetting or failure of toilet training with other worrying signs
- Before and after bladder surgery
- Because a small, high-pressure bladder can be relatively dry and still be damaging the kidneys
Before the Day
- The urine must be free of infection
- The bowel should be empty — constipation distorts the results
- A bladder diary kept for a few days beforehand is genuinely useful
On the Day
- Fine catheters are placed in the bladder and back passage
- The bladder is filled slowly while pressures are recorded
- The child is asked to report sensation and to pass urine at the end
- Around an hour; uncomfortable rather than painful
What the Results Show
- Reports capacity, compliance, unstable contractions and leak point pressure
- High storage pressure is the finding that most predicts kidney damage
- Guides medication, catheterisation and any decision about surgery
Is It Safe?
- Mild stinging and a slight increase in infection risk, which is why antibiotic cover is often given
- No radiation unless combined with X-ray imaging
Common Questions
If your question is not here, send it on WhatsApp and the hospital team will answer.
Dr. Pratheep Samraj
Consultant Paediatric & Neonatal Surgeon · Palliyadi, Kanyakumari
Super-specialist surgical care for newborns, infants and children, with expertise in paediatric urology, congenital anomalies, gastro-intestinal surgery and minimally invasive surgery.
Related Pages
The pressure inside the bladder is the number that predicts kidney damage.
In a neurogenic bladder that one figure drives the whole plan, from medication to surgery. Bring previous studies so the change over time can be read.
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