Figure 4.

Example depicting stepwise method to calculate TKV in the clinician’s office using the Mayo Clinic ADPKD classification online tool. The first three steps involve measuring the maximal sagittal, coronal, and axial width and depth of each kidney. These measurements can be done using the ruler tool available in most imaging viewing software. The following steps include plugging in the numbers to obtain TKV, classification, and estimation of future eGFR (see http://www.mayo.edu/research/documents/pkd-center-adpkd-classification/doc-20094754).