Kidney Volume Calculator (ultrasound)

Notes

• This calculator uses an ellipsoid formula:
  • volume = length × width × thickness × π/6
• While this formula has been widely used in the literature, it has limitations. Prior studies comparing the formula to MRI or CT-based volumetry as ground truth has found that this ellipsoid equation tends to underestimate kidney volume by ~15- 25%.


• It has also significant intra-, and interobserver variability, which should be taken into account if comparing results with prior measurements.
  • ^{Bakker J, Olree M, Kaatee R, de Lange EE, Moons KG, Beutler JJ, Beek FJ. Renal volume measurements: accuracy and repeatability of US compared with that of MR imaging. Radiology. 1999 Jun;211(3):623-8. doi: 10.1148/radiology.211.3.r99jn19623. PMID: 10352583.}
  • ^{Kim HC, Yang DM, Lee SH, Cho YD. Usefulness of renal volume measurements obtained by a 3-dimensional sonographic transducer with matrix electronic arrays. J Ultrasound Med. 2008 Dec;27(12):1673-81. doi: 10.7863/jum.2008.27.12.1673. PMID: 19022993.}