Gestational diabetes mellitus (GDM) is a form of diabetes that develops during pregnancy and resolves in most cases after delivery. For women over 35, it’s one of the pregnancy complications that healthcare providers monitor closely—not because it’s inevitable, but because age is among several factors associated with increased risk. Understanding what gestational diabetes is, how it’s screened, and what management typically involves can help you approach your prenatal care with clarity rather than anxiety.
According to the American College of Obstetricians and Gynecologists (ACOG), gestational diabetes affects an estimated 6 to 9 percent of pregnancies in the United States, though rates vary based on the screening criteria used. While the condition does require attention and management, most women with gestational diabetes have healthy pregnancies and babies when working closely with their healthcare team.
Why Age Is a Risk Factor for Gestational Diabetes
The relationship between maternal age and gestational diabetes risk is well-documented in research, though the mechanisms are multifaceted. As women age, insulin sensitivity—how efficiently the body’s cells respond to insulin—may decrease somewhat, which can affect how the body manages the natural insulin resistance that occurs during pregnancy. Additionally, women over 35 may be more likely to have other risk factors associated with GDM, such as higher pre-pregnancy BMI or family history of type 2 diabetes.
It’s important to note, however, that age alone doesn’t determine gestational diabetes risk. Many women over 35 have uncomplicated pregnancies with normal glucose metabolism, while younger women can also develop GDM. Risk assessment involves looking at the whole picture of your health history.
Other Risk Factors to Be Aware Of
Beyond age, several other factors are associated with increased GDM risk. These include a personal history of gestational diabetes in a previous pregnancy, a family history of type 2 diabetes, being overweight or obese before pregnancy, a history of polycystic ovary syndrome (PCOS), and having delivered a baby weighing over 9 pounds previously. Ethnicity is also a recognized factor, with higher rates of GDM observed in some populations.
If you have multiple risk factors, your prenatal care provider may recommend earlier or additional screening. This is worth discussing at your first prenatal appointment so you understand what to expect.
How Gestational Diabetes Is Screened and Diagnosed
Standard prenatal care in the United States typically includes glucose screening between 24 and 28 weeks of pregnancy for most women. Women with higher risk factors may be screened earlier. The most common approach involves two steps:
The Glucose Challenge Test (GCT)
The initial screening test involves drinking a sugary glucose solution and having blood drawn one hour later to check your blood glucose level. No fasting is required. This test identifies women who may need further testing—a positive result doesn’t diagnose gestational diabetes but indicates the need for a follow-up test.
The Oral Glucose Tolerance Test (OGTT)
If your one-hour test result is above a certain threshold, your provider will typically order the three-hour OGTT, which does require fasting. Multiple blood draws are taken over three hours after drinking a larger glucose solution. Gestational diabetes is diagnosed if two or more of these readings are above established thresholds. Some providers offer a one-step approach using the 75-gram OGTT, which involves fasting and two-hour testing.
Managing Gestational Diabetes: What the Process Typically Looks Like
For many women, gestational diabetes is managed effectively through dietary adjustments and monitoring. A registered dietitian with experience in prenatal nutrition can be an invaluable part of your care team—they can help you develop an eating pattern that supports healthy blood glucose levels while ensuring adequate nutrition for you and your baby.
Blood glucose monitoring, typically done with a home glucometer several times daily, helps track how your body is responding to the management approach. Your healthcare provider will set target ranges for your readings before meals and one to two hours after eating.
When Medication Is Needed
Some women find that diet and lifestyle adjustments alone are sufficient to maintain healthy blood glucose levels. Others may need insulin or, in some cases, oral medication (such as metformin or glyburide) to help achieve target ranges. If medication is recommended, your provider and care team can explain the specifics of what’s involved and answer your questions. Medication use in gestational diabetes management is common and not a reflection of doing something “wrong”—it simply reflects how your body is processing glucose during pregnancy.
Monitoring Your Baby and Pregnancy
Women with gestational diabetes typically receive additional prenatal monitoring. This may include more frequent prenatal visits, additional ultrasounds to monitor fetal growth (since GDM can sometimes contribute to larger-than-average fetal size), and non-stress tests or biophysical profiles in the third trimester. Your provider will tailor monitoring recommendations to your individual situation and glucose control.
If third-trimester monitoring is recommended more frequently than a standard pregnancy, this reflects appropriate caution rather than cause for alarm. Most women with well-managed gestational diabetes deliver healthy babies at term.
After Delivery: What Happens to Gestational Diabetes
For the majority of women, gestational diabetes resolves after delivery as hormonal levels return to their pre-pregnancy state. However, having had GDM is associated with an increased risk of developing type 2 diabetes later in life—research suggests that up to 50 percent of women with gestational diabetes may develop type 2 diabetes within 10 years, though lifestyle factors appear to influence this risk considerably.
ACOG recommends that women who’ve had gestational diabetes be tested for diabetes or prediabetes 4 to 12 weeks after delivery, and then periodically thereafter. Maintaining a healthy weight, regular physical activity, and a balanced diet may help reduce long-term risk, though your healthcare provider is best positioned to guide you based on your individual health profile.
Frequently Asked Questions
Does gestational diabetes mean I ate too much sugar during pregnancy?
No—gestational diabetes is not caused by eating too much sugar or making poor dietary choices. It occurs when the body cannot produce enough insulin to overcome the natural insulin resistance of pregnancy, which is influenced by hormonal changes, age, genetics, and other factors. Managing GDM with dietary adjustments doesn’t mean sugar caused it in the first place.
Will I definitely need to have a C-section if I have gestational diabetes?
Not necessarily. Many women with well-managed gestational diabetes deliver vaginally at term. Factors that might influence delivery planning include how well glucose levels have been controlled, fetal size, and other individual considerations. Your provider will discuss delivery planning with you based on your specific situation as your due date approaches.
Is my baby at risk because I have gestational diabetes?
Well-managed gestational diabetes significantly reduces the risks associated with the condition. Potential concerns—such as macrosomia (larger-than-average birth weight), newborn hypoglycemia, and breathing difficulties—are more associated with poorly controlled GDM. Your healthcare team’s monitoring and management approach is specifically designed to support a healthy outcome for you and your baby.
Can I prevent gestational diabetes?
While not all cases are preventable, research suggests that healthy weight before pregnancy, regular physical activity, and a balanced diet may reduce risk. However, some women develop GDM despite following healthy habits, because genetic and hormonal factors also play significant roles. Focus on what you can reasonably do, and work with your healthcare provider for appropriate screening and management if needed.
Key Takeaways
- Gestational diabetes affects a minority of pregnancies but is more commonly detected in women over 35, though age is just one of several risk factors.
- Standard screening occurs between 24 and 28 weeks; women with higher risk factors may be screened earlier.
- Most cases are manageable with dietary adjustments and blood glucose monitoring; some women need medication as well.
- Well-managed gestational diabetes is associated with healthy pregnancy outcomes for both mother and baby.
- Post-delivery follow-up is important, as GDM is associated with increased longer-term risk for type 2 diabetes—a healthcare provider can guide appropriate monitoring and prevention strategies.
Medical Disclaimer
This content is for informational purposes only and does not constitute medical advice. Individual health situations vary significantly. Always consult a qualified healthcare provider before making decisions related to your health, fertility, or pregnancy.
About the Author
Emily Carter is a women’s health writer focused on fertility, pregnancy after 35, and sleep changes in midlife. She writes research-informed, non-alarmist content to help women navigate reproductive and hormonal transitions with clarity and confidence.