Preconception care of diabetes. Glycemic control prevents congenital anomalies

JAMA. 1991 Feb 13;265(6):731-6.


To test the value of intensive management of diabetes before and during early pregnancy, 84 women recruited prior to conception were compared with 110 women who were already pregnant referred at 6 to 30 weeks' gestation. All underwent daily measurement of fasting and postprandial capillary blood glucose levels. Mean blood glucose levels during embryogenesis and organogenesis were within 3.3 to 7.8 mmol/L in 50% of preconception subjects and exceeded 10 mmol/L in 6.5%. One major congenital anomaly occurred in 84 infants (1.2%) of women treated before conception compared with 12 anomalies in 110 infants (10.9%) of mothers in the postconception group. Transient symptomatic hypoglycemia occurred during embryogenesis in 60% of women in the preconception group, with a median frequency of 2.7 episodes per week, but was not associated with excess malformations. We conclude that education and intensive management for glycemic control of diabetic women before and during early pregnancy will prevent excess rates of congenital anomalies in their infants.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Congenital Abnormalities / prevention & control*
  • Diabetes Mellitus, Type 1 / blood
  • Diabetes Mellitus, Type 1 / prevention & control*
  • Female
  • Fertilization
  • Glycated Hemoglobin / analysis
  • Humans
  • Hyperglycemia / blood
  • Hyperglycemia / prevention & control*
  • Patient Education as Topic*
  • Pregnancy
  • Pregnancy Trimester, First
  • Pregnancy in Diabetics / blood
  • Pregnancy in Diabetics / prevention & control*
  • Prenatal Care


  • Glycated Hemoglobin A