First, it allows for prediction of disease progression in conjunction with clinical parameters (sex, hypertension, urological event), as demonstrated by the PROPKD score.4 Second, genetic analysis enables detection of ADPKD phenocopies and excludes PKD1/2-negative patients from potentially harmful treatment, given that studies on tolvaptan in ADPKD phenocopies are lacking. The gene discussed is PKD1; the disease is Hypertension.