Large decreases in insulin requirement occurred repeatedly in two pregnancies in a type 1 diabetic woman.

Whereas the increase in insulin requirement in late gestation is well described in diabetic pregnancy, a decrease in insulin dosage in the end of the third trimester has also been noted in clinical experience and the prevention of hypoglycaemia is important. Here we report a large decrease (over 50%) in the final few weeks of her two gestations in a woman with type 1 diabetes mellitus.