HNF1B and autosomal dominant medullary cystic kidney disease with or without hyperuricemia: Although serum potassium (K+) and bicarbonate (HCO3−) levels are poorly reported in ADTKD-HNF1β cohorts, Adalat and colleagues demonstrated that HNF1β patients have decreased serum K+ and increased serum HCO3− levels, especially in late childhood [6].