Renal resistive indexes: variability in Doppler US measurement in a healthy population.

Journal Article (Journal Article)

PURPOSE: To determine the variability in resistive index (RI) in normal kidneys, possible causes of variability, and consequences of reporting a single value. MATERIALS AND METHODS: Doppler ultrasound RI measurements were obtained in the upper, middle, and lower regions of 118 kidneys in 58 healthy subjects (aged 24-70 years; 35 women, 23 men) who subsequently underwent angiography. The effects of sampling a particular parenchymal region, vascular territory, or kidney were assessed. RESULTS: Kidney region, vascular territory, and right versus left kidney had no consistently significant effect (P < or = .05) on RI. Age had a statistically significant effect. RI readings were highly correlated with each other both within a subject and within a kidney. The probability that a single RI value would exceed 0.70 in a healthy 45-year-old subject was 6%; this decreased to 3% when three readings were averaged. CONCLUSION: The variability of RI measurements in a kidney suggests that a number of RI readings should be averaged before a single representative value is reported.

Full Text

Duke Authors

Cited Authors

  • Keogan, MT; Kliewer, MA; Hertzberg, BS; DeLong, DM; Tupler, RH; Carroll, BA

Published Date

  • April 1996

Published In

Volume / Issue

  • 199 / 1

Start / End Page

  • 165 - 169

PubMed ID

  • 8633141

International Standard Serial Number (ISSN)

  • 0033-8419

Digital Object Identifier (DOI)

  • 10.1148/radiology.199.1.8633141


  • eng

Conference Location

  • United States