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Gestational Diabetes

What is it?

Gestational diabetes is a type of high blood sugar that develops in pregnant women. Diabetes is a condition where the body does not make enough insulin or the insulin doesn’t break down sugar in the blood properly. Gestational diabetes usually affects the second half of pregnancy, and usually goes away after the woman gives birth.

Who gets it?

Gestational diabetes affects nearly 135,000 pregnant women each year, or about four percent of all pregnancies, making it one of the top health concerns related to pregnancy.

A woman may be at a greater risk for developing gestational diabetes if she delivered a still born baby or a large baby (over nine pounds) in the past, has family members with diabetes, has high blood pressure or gains too much weight during pregnancy, is over 30 years old, or is overweight.

What causes it?

Gestational diabetes occurs when hormones produced by the placenta (tissue connecting unborn baby to the uterus) changes the way insulin in the body works. Insulin moves glucose (sugar) out of the blood and into the cells of the body. In women with gestational diabetes, the glucose can’t get into the cells so the amount of glucose in the blood continues to build.

What are the symptoms?

Symptoms of gestational diabetes include intense thirst and hunger, the need to urinate often and tiredness. Blurred vision may be another symptom. In addition, an ultrasound test may reveal too much fluid around the unborn baby, which is another symptom of gestational diabetes.

How is it diagnosed?

To diagnose gestational diabetes, the doctor may ask the patient to under a blood sugar test. The patient will be asked to consume several ounces of a sugary drink. After a certain amount of time, the doctor will take a sample of the patient’s blood to check sugar levels. If the level of sugar in the blood is high, the doctor may recommend the patient undergo another blood test.

In the next test, blood is drawn from a vein in the patient's arm after a period at least eight hours when the patient has not eaten, usually in the morning before breakfast. The patient will then be asked to drink another sugary drink, and have blood drawn every hour for several hours to test how the body is handling the sugar in the blood over a period of time. The red blood cells are separated from the sample and the amount of glucose is measured in the remaining plasma.

What is the treatment?

Gestational diabetes can put women at greater risk for birth complications if left untreated. Without treatment, women with this condition could have very large babies, and as result, have difficult labor and deliveries. Some patients will need to surgery to deliver their larger babies, which can increase the patient’s risk of infection and lengthen recovery time.

The patient diagnosed with gestational diabetes should follow her doctor’s recommended treatment plan to keep the condition under control. The doctor may recommend testing the patient’s blood sugar level, eat a healthy diet, and exercise. Some patients also need to take insulin as part of their treatment.

Self-care tips

Most women diagnosed with gestational diabetes have healthy pregnancies and healthy babies because they follow recommended treatment and control their blood sugar level.  Usually gestational diabetes goes away after the baby is born.


This information has been designed as a comprehensive and quick reference guide written by our health care reviewers.  The health information written by our authors is intended to be a supplement to the care provided by your physician.  It is not intended nor implied to be a substitute for professional medical advice. 

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This page was last updated on October 31, 2006
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