The guidance, on diabetes in pregnancy, recommends that GPs inform diabetic women who are planning to become pregnant about the importance of good glycaemic control before conception and throughout pregnancy.
Good glycaemic control can reduce the risk of miscarriage, congenital malformation, stillbirth and neonatal death, said NICE.
Women should use contraception until good glycaemic control is established, according to the guidance.
During pregnancy, women with diabetes should keep fasting blood glucose between 3.5 and 5.9 mmol/l and one-hour postprandial blood glucose below 7.8 mmol/l.
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