Show Summary Details
Page of

Diabetes in pregnancy 

Diabetes in pregnancy
Diabetes in pregnancy

Bryony Jones

, and Anne Dornhorst

Page of

PRINTED FROM OXFORD MEDICINE ONLINE ( © Oxford University Press, 2021. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a title in Oxford Medicine Online for personal use (for details see Privacy Policy and Legal Notice).

date: 02 March 2021

Diabetes in pregnancy is predominantly either pre-existing type 1 or type 2 diabetes mellitus, or gestational diabetes, the latter defined as diabetes or glucose intolerance first diagnosed during the pregnancy. Gestational diabetes usually arises in the late second trimester and is common, affecting from 2–6% to 15–20% of pregnant women depending on diagnostic criteria and country of origin. Gestational diabetes is most commonly diagnosed on the basis of an oral glucose tolerance test performed at 24–28 weeks’ gestation by a plasma glucose at 0 minutes of more than 5.1 (or >5.6, depending on the authority) mmol/L, or at 120 minutes of more than 8.5 (or >7.8) mmol/L. The effect of pregnancy on maternal glycaemic control ceases very quickly post-partum, hence women with pre-existing diabetes taking insulin should immediately revert to their pre-pregnancy regimen after birth, but with a lower insulin dose.

Access to the complete content on Oxford Medicine Online requires a subscription or purchase. Public users are able to search the site and view the abstracts for each book and chapter without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.