Glycogen storage disease (GSD) type Ia (glucose-6-phosphatase deficiency) and Ib (glucose-6-phosphate transporter deficiency) are both clinically characterized by fasting hypoglycaemia and hepatomegaly. Chronic kidney disease (CKD) with loss of glomerular filtration rate and albuminuria/proteinuria is a known long-term complication of GSD I that has become less frequent with improvement of therapy over the last decades. We retrospectively investigated a cohort of 63 GSD I patients (51 GSD Ia, …