Gestational Diabetes Explained: Screening, Blood Sugar, and Daily Care

Gestational diabetes is high blood glucose first developing during pregnancy. It happens when the body cannot make enough insulin to meet pregnancy’s extra needs. You may feel entirely well when it is diagnosed, so the result can be unexpected. Treatment can reduce risks for you and your baby.

Understand what your result means

Many cases are found through screening rather than symptoms. In NHS care, an oral glucose tolerance test is usually offered between 24 and 28 weeks when risk factors are present, with earlier testing after gestational diabetes in a previous pregnancy. Testing arrangements differ internationally.

Ask which result led to the diagnosis and what happens next. NICE recommends review with a joint diabetes and antenatal clinic within a week of diagnosis. If you have not received a plan, contact the service that gave you the result. Our screening guide explains the test separately from ongoing care.

Build a daily plan you understand

Care usually includes checking blood glucose, individual food advice, appropriate activity and sometimes medicine. A specialist team can help you use the equipment and interpret patterns. Ask for the target range, testing times and instructions for sharing results in writing.

Our blood glucose monitoring guide explains the questions to ask. A reading is information for treatment, not a measure of effort or worth. Do not hide unexpected values or change medicine without your agreed plan.

A dietitian can help you adapt familiar meals. Medicine may be needed even when you follow food and activity advice, and requirements can change as pregnancy progresses. The gestational diabetes meals guide focuses on that practical support.

Discuss pregnancy and birth care

Higher glucose can contribute to a baby growing larger than expected and to low blood glucose after birth. Additional checks of growth and wellbeing may therefore be offered. Birth timing and care depend on glucose management and any other concerns; a diagnosis does not automatically mean a caesarean birth.

Ask what monitoring is planned for you and your baby around birth, including feeding support and newborn glucose checks. If you become unwell or have high glucose, seek urgent advice from your diabetes or maternity team rather than waiting for routine review.

Keep the plan after birth

Gestational diabetes often resolves after birth, but future type 2 diabetes risk remains higher. In NHS care, a diabetes blood test is recommended 6 to 13 weeks after birth, followed by yearly testing if normal. Attend even if you feel well.

Confirm medicine changes with your team and tell future pregnancy care providers about this diagnosis so early testing can be arranged.