The absorbed doses in the kidneys of adult patients have been evaluated using the biokinetics of radiopharmaceuticals containing Tc99m (DTPA) / Tc99m (MAG3) or Tc99m (DMSA). The absorbed dose to the kidneys, was calculated using the formalism MIRD, and its representation Cristy-Eckerman. The absorbed dose in the kidneys, due to Tc99m (DTPA)/Tc99m (MAG3), are given by 0, 00466mGy.MBq-1 / 0.00339 mGy.MBq-1 . Approximately 21.2% / 8.8% of the absorbed dose is due to the organs that are part of the biokinetics of Tc99m (DTPA) / Tc99m (MAG3): bladder (content) and remaining tissue. The absorbed dose to the kidneys due to Tc99m (DMSA) is 0.17881 mGy. MBq-1 . Here, 1.7% of the absorbed dose is due to the organs that are part of the biokinetics of Tc99m (DMSA): bladder, spleen, liver and the remaining tissue.