Funding Information: This work was supported by grant UID/BIM/00009/2016, Portuguese Science and Technology Foundation. Publisher Copyright: © 2023 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.; Familial Renal Glucosuria (FRG) is a co-dominantly inherited trait characterized by orthoglycaemic glucosuria. From 2003 to 2015 we have reported several cohorts validating SLC5A2 (16p11.2), encoding SGLT2 ...