Diuretic renography

What it is

Renal scans and the administration of a diuretic are used to diagnose urinary tract obstruction, beginning from 6 to 8 weeks of age.

What it does

- Assesses differential renal function (DRF) in each kidney.
- Measures the drainage time (washout) from the renal pelvis.

Keep in mind

The state of hydration of the infant and the timing of the diuretic administration affect the accuracy of the diuretic renogram.

What to use

The preferred radioisotope is technetium-99m mercaptoacetyltriglycine (Tc-99m MAG3)

What to look for

Washout time greater than 20 minutes indicates an impairment of urine outflow from the pelvis.

The difference in split function (DFR) of less than 40% in a single kidney and/or 10% decrease in DRF compared to the previous diuretic renograms indicate an obstructive pattern

mag-3 diuretic renography – left kidney obstructive uropathy
Obstructive uropathies | 2. Diagnosing obstructive uropathy
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