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Heterozygous mutations in GCK result in a persistent, mildly raised glucose from birth, but it is usually diagnosed in adulthood as maturity‐onset diabetes of the young (MODY), where hyperglycemia is often an incidental finding. The hyperglycemia of GCK‐MODY is benign and does not require treatment, but is important to be aware of, particularly in females where it has implications for managing pregnancy...