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British Journal of Radiology (1995) 68, 1087-1089
© 1995 British Institute of Radiology
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The British Journal of Radiology, Vol 68, Issue 814 1087-1089, Copyright © 1995 by British Institute of Radiology

ARTICLES

How reliable are ultrasound measurements of renal length in adults?

MJ Ablett, A Coulthard, RE Lee, DL Richardson, T Bellas, JP Owen, MJ Keir and TJ Butler
Department of Radiology, Royal Victoria Infirmary, Newcastle upon Tyne, UK.

Ultrasound assessment of patients with renal impairment commonly includes measurement of bipolar renal length. Reduction in length is considered to indicate chronic renal disease and is a factor in deciding whether to proceed to renal biopsy. To date, no published data are available on interobserver and intraobserver variation in sonographic renal length measurement in adults. Bilateral renal lengths were measured in 20 adult subjects, with no history of renal disease, by three experienced operators, on two separate occasions. Limits of agreement for replicate measurements by each ultrasonographer and for replicate measurements by each pair of ultrasonographers were determined. Values of repeatability (a measure of intraobserver variation) and reproducibility (a measure of interobserver variation) were calculated for all renal length measurements, and for right and left renal lengths separately. Results indicate that replicate renal length measurements differ by less than 1.85 cm in 95% of cases, and the magnitude of variations is similar when measurements are made by either single or different ultrasonographers, and are similar for right and left renal length measurements. This suggests that sonographic bipolar renal length measurements in normal adult kidneys are reasonably reliable. In diseased kidneys, however, in which identification of renal poles is difficult, interobserver and intraobserver variation may be much greater.


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