Renal Length Calculator

by Jonathan Colledge

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Expected Renal Length Calculation for children

Please use ddmmyy, ddmmyyyy, dd/mm/yyyy, dd-mm-yyyy, dd/mm/yy, or dd-mm-yy.

Date of Birth:

Date of Ultrasound:

Manual Age (in years, optional, only add if not using dates):

Measured right kidney length (optional, in cm):
Measured left kidney length (optional, in cm):

Result:

Expected renal length for a single kidney:

(The mean renal length will be automatically copied to your clipboard.)

Figure derived from data presented in Rosenabaum et al (1). Polynomial curves have been fitted through data with a three group moving average standard deviation. One of the lowest standard deviations is at birth. This is not congruent with the remaining data and I have chosen not to set the intercept - this way the data conform better with Han and Babcock (2). The data are limited by very small numbers above 16 years of age. The results are only approximate and consideration should be given to adult renal sizes - certainly this tool cannot be used in adults.

References

Rosenbaum DM, Korngold E, Teele RL. Sonographic assessment of renal length in normal children. AJR Am J Roentgenol. 1984 Mar;142(3):467-9. doi: 10.2214/ajr.142.3.467. PMID: 6607625.
BK Han and DS Babcock. Sonographic measurements and appearance of normal kidneys in children. American Journal of Roentgenology 1985 145:3, 611-616
Krill A, Salami S, Rosen L, Friedman SC, Gitlin J, Palmer LS. Evaluating compensatory hypertrophy: a growth curve specific for solitary functioning kidneys. J Urol. 2012 Oct;188(4 Suppl):1613-7. doi: 10.1016/j.juro.2012.02.035. Epub 2012 Aug 19. PMID: 22910263.
Ezeofor SN, Anyanwu GE, Obikili EN. Reference indices for evaluating kidney dimensions in children using anthropometric measurements. SA J Radiol. 2020 Aug 5;24(1):1882. doi: 10.4102/sajr.v24i1.1882. PMID: 32934838; PMCID: PMC7479434.
Harmse, W. (2011). Normal variance in renal size in relation to body habitus. South African Journal of Radiology, 15(4), 123. doi:https://doi.org/10.4102/sajr.v15i4.355
(1961) Part I: Size of Normal Kidneys in Adults, Acta Radiologica, 55:sup206, 7-31, DOI: 10.3109/00016926109177834
Pezeshki Rad M, Abbasi B, Valizadeh N, Hatami F, Tohidinezhad F, Gharehbaghi Z. Evaluation of Normal Renal Size and its Influencing Factors: A Cross-Sectional Study on the Adult Population of Mashhad. Caspian J Intern Med. 2022 Summer;13(3):623-633. doi: 10.22088/cjim.13.3.623. PMID: 35974941; PMCID: PMC9348224.