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A Peek at the Pump
A Peek at the Pump


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Diabetes Library: What is Diabetes?

Gestational Diabetes




Any woman might develop gestational diabetes during pregnancy. Some of the factors associated with women who have an increased risk include: obesity; a family history of diabetes; having given birth previously to a very large infant, a stillbirth, or a child with a birth defect; or having too much amniotic fluid.


What is gestatio/nal diabetesHow does it differ from other diabetesWho is at riskHow does gestational diabetes affect my pregnancyWhat can be done to reduce problems

Approximately three to five percent of all pregnant women in the United States are diagnosed as having gestational diabetes. These women and their families have many questions about this disorder. Some of the most frequently asked questions are: What is gestational diabetes and how did I get it? How does it differ from other kinds of diabetes? Will it hurt my baby? Will my baby have diabetes? What can I do to control gestational diabetes? Will I need a special diet? Will gestational diabetes change the way or the time my baby is delivered? Will I have diabetes in the future?

This article will address these and many other questions about diet, exercise, measurement of blood sugar levels, and general medical and obstetric care of women with gestational diabetes. It must be emphasized that these are general guidelines and only your health care professional(s) can tailor a program specific to your needs. You should feel free to discuss any concerns you have with your doctor or other health care provider, as no one knows more about you and the condition of your pregnancy.

What is gestational diabetes and what causes it?

Diabetes (actual name is diabetes mellitus) of any kind is a disorder that prevents the body from using food properly. Normally, the body gets its major source of energy from glucose, a simple sugar that comes from foods high in simple carbohydrates (e.g., table sugar or other sweeteners such as honey, molasses, jams, and jellies, soft drinks, and cookies), or from the breakdown of complex carbohydrates such as starches (e.g., bread, potatoes, and pasta). After sugars and starches are digested in the stomach, they enter the blood stream in the form of glucose. The glucose in the blood stream becomes a potential source of energy for the entire body, similar to the way in which gasoline in a service station pump is a potential source of energy for your car. But, just as someone must pump the gas into the car, the body requires some assistance to get glucose from the blood stream to the muscles and other tissues of the body. In the body, that assistance comes from a hormone called insulin. Insulin is manufactured by the pancreas, a gland that lies behind the stomach. Without insulin, glucose cannot get into the cells of the body where it is used as fuel. Instead, glucose accumulates in the blood to high levels and is excreted or "spilled" into the urine through the kidneys.

When the pancreas of a child or young adult produces little or no insulin we call this condition juvenile-onset diabetes or Type I diabetes (insulin-dependent). This is not the type of diabetes you have. Unlike women with Type I diabetes, women with gestational diabetes have plenty of insulin. In fact, they usually have more insulin in their blood than women who are not pregnant. However, the effect of their insulin is partially blocked by a variety of other hormones made in the placenta, a condition often called insulin resistance.

The placenta performs the task of supplying the growing fetus with nutrients and water from the mother's circulation. It also produces a variety of hormones vital to the preservation of the pregnancy. Ironically, several of these hormones such as estrogen, cortisol, and human placental lactogen (HPL) have a blocking effect on insulin, a "contra-insulin" effect. This contra-insulin effect usually begins about midway (20 to 24 weeks) through pregnancy. The larger the placenta grows, the more these hormones are produced, and the greater the insulin resistance becomes. In most women the pancreas is able to make additional insulin to overcome the insulin resistance. When the pancreas makes all the insulin it can and there still isn't enough to overcome the effect of the placenta's hormones, gestational diabetes results. If we could somehow remove all the placenta's hormones from the mother's blood, the condition would be remedied. This, in fact, usually happens following delivery.

How does gestational diabetes differ from other types of diabetes?

There are several different types of diabetes. Gestational diabetes begins during pregnancy and disappears following delivery. Another type is referred to as juvenile-onset diabetes (in children) or Type I (in young adults). These individuals usually develop their disease before age 20. People with Type I diabetes must take insulin by injection every day. Approximately 10 percent of all people with diabetes have Type I (also called insulin-dependent diabetes).

Type II diabetes or noninsulin-dependent diabetes (formerly called adult-onset diabetes) is also characterized by high blood sugar levels, but these patients are often obese and usually lack the classic symptoms (fatigue, thirst, frequent urination, and sudden weight loss) associated with Type I diabetes. Many of these individuals can control their blood sugar levels by following a careful diet and exercise program, by losing excess weight, or by taking oral medication. Some, but not all, need insulin. People with Type II diabetes account for roughly 90 percent of all diabetics.

Who is at risk for developing gestational diabetes and how is it detected?

Any woman might develop gestational diabetes during pregnancy. Some of the factors associated with women who have an increased risk are obesity; a family history of diabetes; having given birth previously to a very large infant, a stillbirth, or a child with a birth defect; or having too much amniotic fluid (polyhydramnios). Also, women who are older than 25 are at greater risk than younger individuals. Although a history of sugar in the urine is often included in the list of risk factors, this is not a reliable indicator of who will develop diabetes during pregnancy. Some pregnant women with perfectly normal blood sugar levels will occasionally have sugar detected in their urine.

The Council on Diabetes in Pregnancy of the American Diabetes Association strongly recommends that all pregnant women be screened for gestational diabetes. Several methods of screening exist. The most common is the 50-gram glucose screening test. No special preparation is necessary for this test, and there is no need to fast before the test. The test is performed by giving 50 grams of a glucose drink and then measuring the blood sugar level l-hour later. A woman with a blood sugar level of less than 140 milligrams per deciliter (mg/dl) at one hour is presumed not to have gestational diabetes and requires no further testing. If the blood sugar level is greater than 140 mg/dl the test is considered abnormal or "positive:" Not all women with a positive screening test have diabetes. Consequently, a three hour glucose tolerance test must be performed to establish the diagnosis of gestational diabetes.

If your physician determines that you should take the complete three hour glucose tolerance test, you will be asked to follow some special instructions in preparation for the test. For three days before the test, eat a diet that contains at least 150 grams of carbohydrates each day. This can be accomplished by including one cup of pasta, two servings of fruit, four slices of bread, and three glasses of milk every day. For 10 to 14 hours before the test you should not eat and not drink anything but water. The test is usually done in the morning in your physician's office or in a laboratory. First, a blood sample will be drawn to measure your fasting blood

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