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Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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Sequential images are obtained at 5-20 second intervals over a period of 20-30 minutes. A renogram is constructed by plotting activity of the isotope against time in selected regions. Three phases are recognised:

  • vascular phase - a rapidly rising curve of activity due to arrival of isotope in the kidney from the bloodstream. It is usually of about 30 seconds duration.
  • filtration phase - a more slowly rising curve denoting concentration of isotope as it passes into the collecting system
  • excretory phase - a declining curve denoting that isotope is no longer being delivered to the kidney but continues to pass down the ureter

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