Capillary electrophoresis for the determination of glomerular filtration rate using nonradioactive iohexol

Am J Kidney Dis. 1996 Aug;28(2):173-7. doi: 10.1016/s0272-6386(96)90298-x.


High-performance liquid chromatography (HPLC) has been used as an alternative to the isotopic method to calculate glomerular filtration rate (GFR). With the HPLC method, serum iohexol or iothalamate levels are measured, and the plasma clearance rate of the compound is used as a surrogate for GFR. However, HPLC is a labor-intensive procedure, which limits its usefulness in the clinical setting. Capillary electrophoresis, a newer technique in which electrophoretic separations are performed in capillary tubes, is easier and faster than HPLC. We used capillary electrophoresis for the determination of serum iohexol levels and the calculation of GFR. Patients underwent a simultaneous 125I-iothalamate clearance test and a plasma iohexol clearance test to determine GFR. Mean GFR (+/-SD) was 70.9 +/- 29.9 mL/min (range, 14.5 to 131 mL/min) in 52 patients as determined by standard iothalamate clearance methods. For iohexol clearance, the correlation coefficient and standard error were 0.93 and 10.9 mL/min, respectively, using capillary electrophoresis compared with the iothalamate method. Capillary electrophoresis is a simple, rapid method that can be used to calculate GFR and provides results at least as accurate as those obtained by HPLC and x-ray fluorescence.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Aged
  • Chromatography, High Pressure Liquid / methods
  • Chromatography, High Pressure Liquid / statistics & numerical data
  • Contrast Media* / analysis
  • Contrast Media* / pharmacokinetics
  • Electrophoresis, Capillary / methods
  • Electrophoresis, Capillary / statistics & numerical data
  • Evaluation Studies as Topic
  • Female
  • Glomerular Filtration Rate*
  • Humans
  • Iodine Radioisotopes / analysis
  • Iodine Radioisotopes / pharmacokinetics
  • Iohexol* / analysis
  • Iohexol* / pharmacokinetics
  • Iothalamic Acid / analysis
  • Iothalamic Acid / pharmacokinetics
  • Male
  • Metabolic Clearance Rate
  • Middle Aged
  • Time Factors


  • Contrast Media
  • Iodine Radioisotopes
  • Iothalamic Acid
  • Iohexol