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Gestational diabetes is a type of diabetes that affects pregnant women, usually during the second or third trimester. Women with gestational diabetes don’t have diabetes before their pregnancy, and after giving birth it usually goes away. In some women diabetes may be diagnosed in the first trimester, and in these cases the condition most likely existed before pregnancy.
Gestational diabetes is usually diagnosed through a blood test at 24–28 weeks into pregnancy.
Women who have had the condition in previous pregnancies may be tested earlier. With good management of gestational diabetes, you can increase your chances of having a healthy pregnancy and baby.
What causes gestational diabetes?
The hormones produced during pregnancy can make it difficult for your body to use insulin properly, putting you at an increased risk of insulin resistance. And, because pregnancy places a heavy demand on the body, some women are less able to produce enough insulin to overcome this resistance. This makes it difficult to use glucose properly for energy, so the glucose remains in the blood and the levels rise, leading to gestational diabetes.
Source: Diabetes UK (https://www.diabetes.org.uk/)