glycogen storage disease Ib (Monarch Disease Ontology identifier MONDO_0009288) is a type of glycogenosis due to G6P deficiency. Also known as: G6P deficiency type IB, G6P translocase deficiency, G6PT deficiency, GSD Ib, GSD due to G6P deficiency type IB, GSD due to G6PT deficiency, GSD type 1 non a, GSD type 1b.