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Journal of Nuclear Medicine Technology

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Imaging

Determination of Glomerular Filtration Rate Using Technetium-99m-DTPA with Differing Degrees of Renal Function

Kathryn A. Morton, David E. Pisani, John H. Whiting, Alfred K. Cheung, John M. Arias and Sonia Valdivia
Journal of Nuclear Medicine Technology June 1997, 25 (2) 110-114;
Kathryn A. Morton
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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David E. Pisani
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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John H. Whiting Jr.
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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Alfred K. Cheung
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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John M. Arias
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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Sonia Valdivia
Imaging Service, VA Medical Center, Portland, Oregon; Department of Radiology, LDS Hospital, Salt Lake City, Utah; Departments of Radiology and Medicine, University of Utah, Salt Lake City, Utah; Renal Section, Medicine Service, VA Medical Center, Salt Lake City, Utah; and Department of Radiology, Paracelsus Regional Hospital, Salt Lake City, Utah
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Abstract

Glomerular filtration rate (GFR) is an important index of renal function. Twenty-four-hour creatinine clearance overestimates GFR in patients with poor renal function. Inulin and iothalamate clearances are accepted reference standards for determining GFR but are expensive and laborious. We have previously reported that GFRs obtained by measuring the disappearance of 99mTc-DTPA from ultrafiltered (protein-free) samples of plasma were virtually identical to those obtained by the iothalamate method. However, the subjects used in that study had normal to only moderately decreased renal function.

Methods: The accuracy of measuring GFR by plasma clearance of 99mTc-DTPA was determined in subjects where renal function varied from normal to severely impaired. In all subjects, GFR was established by clearance of 125I-iothalamate from urine and serum and was used as the standard of reference.

Results: For subjects with normal to moderately diminished renal function (GFR > 20 ml/min), the correlation between values of GFR obtained by the DTPA and iothalamate methods was high (n = 18, r = 0.966). The difference between the pairs of GFR values obtained by the two methods was not statistically significant (p > 0.1). In patients with severe renal insufficiency (GFR < 20 ml/min), the correlation between the DTPA and iothalamate methods was poor (n = 11, r = 0.236), and the GFR values obtained by the two methods were statistically different (p < 0.01).

Conclusion: These results suggest that GFR can be determined accurately by plasma clearance of 99mTc-DTPA in all patients except those with severe renal insufficiency.

  • glomerular filtration rate
  • technetium-99m-DTPA
  • iodine-125-iothalamate
  • renal function
  • renography
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Journal of Nuclear Medicine Technology: 25 (2)
Journal of Nuclear Medicine Technology
Vol. 25, Issue 2
June 1, 1997
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Determination of Glomerular Filtration Rate Using Technetium-99m-DTPA with Differing Degrees of Renal Function
Kathryn A. Morton, David E. Pisani, John H. Whiting, Alfred K. Cheung, John M. Arias, Sonia Valdivia
Journal of Nuclear Medicine Technology Jun 1997, 25 (2) 110-114;

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Determination of Glomerular Filtration Rate Using Technetium-99m-DTPA with Differing Degrees of Renal Function
Kathryn A. Morton, David E. Pisani, John H. Whiting, Alfred K. Cheung, John M. Arias, Sonia Valdivia
Journal of Nuclear Medicine Technology Jun 1997, 25 (2) 110-114;
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Keywords

  • glomerular filtration rate
  • technetium-99m-DTPA
  • iodine-125-iothalamate
  • renal function
  • renography
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