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Urology. 2011 Aug;78(2):405-10. doi: 10.1016/j.urology.2011.01.008. Epub 2011 Apr 3.

Simple, age-based formula for predicting renal length in children.

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  • 1Department of Urology, Mount Sinai School of Medicine, New York, NY 10029, USA.

Abstract

OBJECTIVE:

To determine a simple, age based formula for predicting ideal renal length in children. Renal size is a valuable marker in the evaluation of children with urological disorders. Although many authors have described complex nomograms and multivariate formulas for determining renal size, we propose a simple and accurate formula.

MATERIAL AND METHODS:

All renal ultrasound (US) studies performed over a 9-year period in patients <18 years of age were retrospectively evaluated, excluding patients with a history of urinary tract disease or with abnormal renal US findings.

RESULTS:

Ultrasounds were performed in 778 children <18 years who met inclusion criteria. Sixty-one percent of the patient population was ≥1 year of age at the time of the US. Forty-four percent of the children were male. In children 1 year of age or older, the formula was length (cm) = age (years) × 0.3 + 6, R(2) = .81. In infants younger than 1 year, renal length was poorly estimated by a simple age-based formula.

CONCLUSION:

Our proposed formula can be used to predict renal length in children older than 1 year.

Copyright © 2011 Elsevier Inc. All rights reserved.

PMID:
21459422
[PubMed - indexed for MEDLINE]
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