How Are Urinary Abnormalities Diagnosed?
Although UTIs can be treated with antibiotics, it's important for a doctor to rule
out any underlying abnormalities in the urinary system when UTIs happen repeatedly.
Kids with recurrent infections should see a pediatric urologist to see what is causing
the infections.
Some problems can be found even before birth. Hydronephrosis that develops before
birth can be detected in a fetus by ultrasound
as early as 16 weeks. In rare cases, doctors may consider neonatal surgery (performing
surgery on an unborn baby) if hydronephrosis affects both kidneys and poses a risk
to the fetus. Most of the time, though, doctors wait until after birth to treat the
condition, because almost half of all cases diagnosed prenatally disappear by the
time a baby is born.
Once a baby suspected to have hydronephrosis or another urinary system abnormality
is born, the baby's blood pressure will be monitored carefully, because some kidney
problems can cause high blood pressure.
An ultrasound may be used again to get a closer look at the bladder and kidneys. If
the condition appears to be affecting both kidneys, doctors usually will order blood
tests to measure kidney function.
Testing
If an abnormality of the urinary tract is suspected, doctors might order tests
to make an accurate diagnosis, including:
Ultrasound
Using high-frequency sound waves to "echo," or
bounce, off the body and create a picture of it, an ultrasound can detect some abnormalities
in the kidneys, ureters, and
bladder. It can also measure the size and shape of the kidneys.
When an ultrasound points to VUR or hydronephrosis, a renal scan or voiding cystourethrogram
(VCUG) might give doctors a better idea of what's going on.
Renal scan (nuclear scan)
Radioactive material is injected
into a vein and followed through the urinary tract. The material can show the shape
of the kidneys, how well they function, if there is damaged kidney tissue, and the
course of the urine. A small amount of radiation is received during the test and leaves
the body in the urine.
Voiding cystourethrogram
(VCUG or cystogram)
A catheter (a hollow, soft tube) is used to inject
an opaque dye into the bladder. This X-ray test can diagnose VUR and identify problems
with the bladder or urethra.
Cystoscopy
A cystoscope uses lenses and a light source within
a tube inserted through the urethra to directly view the inside of the bladder. It's
used when other tests or symptoms indicate a possible bladder abnormality.
Intravenous pyelogram
Opaque dye is injected into a vein,
and then X-rays are taken to follow the course of the dye through the urinary system.
Although this test is still used sometimes, the renal MRI and renal scan have replaced
intravenous pyelogram in most cases.
Magnetic resonance urography (MR-U)
This procedure, which
makes a magnetic resonance imaging (MRI) scan of the urinary tract without the use
of dyes or radioactive materials, has been shown to be as accurate as other scans
and is now typically done in place of an intravenous pyelogram.