From healthcare.utah.edu
When you’re pregnant, taking care of your baby’s health means taking care of your health. Learning that you have gestational diabetes mellitus (GDM) can feel overwhelming. You may even wonder if you did something to cause it. But GDM develops because of changes in how the body uses insulin during pregnancy.
According to the American Diabetes Association, about 9% of pregnancies in the U.S. are affected by GDM each year.
What Causes Gestational Diabetes?
Like other types of diabetes, GDM occurs when the body can’t make or use insulin effectively to keep blood sugar levels within a healthy range.
“Pregnancy induces physiologic insulin resistance, which helps make more glucose available to the growing baby,” says Trece Swanson, DNP, a certified nurse midwife in Maternal Fetal Medicine at University of Utah Health.
Most people can make extra insulin to keep their blood sugar in a healthy range during pregnancy. Gestational diabetes develops when the pancreas cannot produce enough insulin to meet the body’s increased needs.
You don’t need to have Type 1 or Type 2 diabetes before pregnancy to develop GDM. However, some factors can increase your risk, including:
- Having a family history of Type 2 diabetes
- Being prediabetic
- Being over the age of 35 during pregnancy
- Having a high body mass index (BMI)
- Having polycystic ovary syndrome (PCOS)
- Being Black, Asian, Hispanic, or American Indian
Having one or more risk factors doesn’t mean you will develop GDM. The condition can also occur in people without known risk factors.
When and How Is Gestational Diabetes Diagnosed?
GDM often has no symptoms, which is why screening is an important part of prenatal care. Patients are typically tested between 24 and 28 weeks of gestation.
The first test usually involves:
- Drinking a glucose beverage: You drink a 50-gram sugary glucose beverage.
- Getting a blood draw: About one hour later, a clinician takes a blood draw.
- Checking your blood sugar: The blood sample is tested to measure the amount of glucose in your blood.
What Happens If Your Blood Sugar is High?
If your blood sugar is above the screening level, the next step is a three-hour diagnostic test.
For this test:
- You will need to fast before the appointment.
- Your blood will be drawn upon arrival.
- You’ll drink a 100-gram glucose beverage.
- Your blood will be drawn hourly for three hours.
If two or more of the four blood sugar measurements are elevated, you will be diagnosed with gestational diabetes.
“The one-hour test is a standard screening test, and a lot of patients wonder why we don’t just do the three-hour test on everybody,” Swanson says, “but we would end up doing a much more involved test for a large volume of people who don’t need it, because most people will pass the one-hour screening.”
Next Steps After a Gestational Diabetes Diagnosis
The good news is that most GDM cases resolve after pregnancy. For many people, a balanced diet and regular exercise can help manage gestational diabetes.
Focus meals on foods such as:
- Lean proteins
- Whole grains
- Vegetables
- Fruits
Limit foods and drinks that can cause blood sugar to rise quickly, such as:
- Sweets
- Sugary drinks
- Highly processed foods
- White bread
- Rice
- Starchy foods
Physical activity can also help manage blood sugar. Talk to your pregnancy care provider about activities that are safe for you. If your provider recommends it, aim for at least 30 minutes of exercise a day. Walking and swimming can be good options during pregnancy.
Managing Your Blood Sugar Levels
Some people may need to check their blood sugar with a simple finger prick in the morning and after meals to ensure that it’s within a healthy range. Healthy blood sugar ranges include:
- Before a meal: Less than 95 mg/dL
- One hour after eating: Less than 140 mg/dL
- Tow hours after eating: Less than 120 mg/dL
Why Treating Gestational Diabetes Is Important
Keeping blood sugar within a healthy range helps protect both you and your baby. When gestational diabetes isn’t well controlled, it can lead to dangerous complications, such as:
- Preeclampsia (very high maternal blood pressure)
- Large birth weight for baby, which increases the possibility of needing a Cesarean section
- Birth trauma due to a large baby
- Increased risk of the birthing parent developing Type 2 diabetes later in life
- Stillbirth
- Low blood sugar for baby after delivery
- Premature birth
The good news is that managing blood sugar can reduce these risks.
https://healthcare.utah.edu/healthfeed/2026/08/how-manage-gestational-diabetes-healthy-pregnancy
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