Gestational diabetes is high blood sugar that develops during pregnancy in people who did not have diabetes before. It affects blood glucose control and requires management through the rest of your pregnancy, but with the right approach most pregnancies with gestational diabetes result in healthy babies. Your care team will screen for it, teach you to monitor your glucose, and adjust your diet or add medication if needed to keep your blood sugar in a safe range.
Managing gestational diabetes means understanding what it is, how to test for it, and what changes to make in eating and activity. You will check your own blood sugar multiple times a day and attend more frequent appointments than a typical pregnancy. This article covers what happens at each stage, what you can control, when to call your clinician, and what to expect after your baby is born.
Table of Contents
- What Gestational Diabetes Is and Why It Matters
- Risk Factors and Who Gets Screened
- The Glucose Tolerance Test and Diagnosis
- Managing Blood Sugar Through Diet
- Monitoring Your Blood Sugar at Home
- When Insulin or Other Medication Is Needed
- What Gestational Diabetes Means for Your Pregnancy
- Labor, Delivery, and Birth
- Blood Sugar After Delivery
- Key Questions to Ask Your Care Team
- Frequently Asked Questions
What Gestational Diabetes Is and Why It Matters
Gestational diabetes is a form of diabetes that starts during pregnancy. Your body makes insulin, a hormone that helps cells use glucose (blood sugar) from food. In gestational diabetes, pregnancy hormones interfere with insulin's ability to work normally, causing glucose to stay high in your blood instead of entering cells. This happens most often in the second or third trimester as placental hormones increase.
The key difference from type 1 or type 2 diabetes is that gestational diabetes develops *only* during pregnancy and may go away after delivery. However, some people find their blood sugar remains abnormal after pregnancy, which is why testing after birth is important. For now, your focus is managing glucose levels during the months ahead.
Why does this matter? High blood sugar in your bloodstream also means high glucose reaching your baby through the placenta. Your baby's pancreas responds by making extra insulin to move that glucose into their cells. This extra glucose gets stored as fat, which can lead to a heavier birth weight and complications during delivery. Keeping your glucose in the target range protects both you and your baby.
Gestational diabetes does not mean you caused it or could have prevented it through diet alone before diagnosis. It is a pregnancy-related condition tied to hormonal changes, not a reflection of your eating habits before you became pregnant. Many people who develop gestational diabetes are otherwise healthy and have no family history of diabetes.
Managing it is very manageable. Most people control their glucose through diet and activity changes alone. Some need insulin or medication, which is also safe and effective. Either way, your baby's outcome depends primarily on how well you and your team keep your blood sugar in the target range.
Risk Factors and Who Gets Screened
Gestational diabetes can develop in any pregnancy, but some people have higher risk. Risk factors include family history of diabetes, being overweight before pregnancy, being older than 25, having a previous pregnancy with gestational diabetes, or having polycystic ovary syndrome (PCOS). Certain ethnic groups have higher rates, though gestational diabetes occurs across all backgrounds.
However, many people with none of these risk factors develop gestational diabetes, and many with multiple risk factors do not. The condition is common enough that screening is offered routinely to most pregnant people, usually between 24 and 28 weeks. Your clinician will explain when you are due for screening and what to expect. Screening usually begins with a glucose tolerance test.
You drink a sugary liquid and have your blood drawn one hour later. This is a quick first-pass test. If your glucose is above the cutoff, you are asked to return for a longer, more definitive test on another day. Having an abnormal first test does not mean you have gestational diabetes—many people retest normally on the full test.
If you have a personal history of gestational diabetes, were diagnosed with type 2 diabetes before pregnancy, or have symptoms of diabetes (like unusual thirst, frequent urination, or fatigue), your clinician may recommend earlier screening or skip the first test and go straight to the longer one. Tell your care team about any family history or previous diagnoses.
Screening is important because untreated gestational diabetes carries real risks. The good news is that it is detectable and manageable. A positive screen is not a failure or a cause for shame—it is information that lets you protect yourself and your baby.
The Glucose Tolerance Test and Diagnosis
The screening test is often called the glucose challenge test. You show up at the lab or clinic, drink an 8-ounce bottle of a sugary glucose solution, wait one hour without eating, and have your blood drawn. The solution tastes very sweet and is designed to be drunk quickly.
Most people tolerate it well. You do not need to fast before this test. If your glucose is 139 mg/dL or below, the screen is normal and you are done. If it is 140 mg/dL or higher, you are asked to return for the three-hour glucose tolerance test, the definitive test for gestational diabetes. Do not panic—many people who fail the first screen pass the second.
The three-hour test requires fasting for at least eight hours before you arrive. You start with a fasting blood draw, then drink a stronger glucose solution (100 grams of glucose), and have your blood drawn at one, two, and three hours afterward. The whole appointment takes about four hours. Bring something to do or a book.
Do not exercise or eat during the test, though water is usually fine. Gestational diabetes is diagnosed if two or more of your four blood draws are higher than the cutoff values. Your clinician will tell you the exact numbers for your lab, as these can vary slightly. One high value does not mean gestational diabetes.
Two or more abnormal values mean you need to begin management. After diagnosis, you will meet with a certified diabetes educator, registered dietitian, or other specialist to learn about blood glucose monitoring, eating patterns, and activity. This education is crucial—it teaches you how to use the tools and make changes that actually work.
Managing Blood Sugar Through Diet
Dietary changes are the first step in managing gestational diabetes and are enough to control glucose in many pregnancies. The goal is to spread carbohydrates throughout the day, pair them with protein and healthy fat, and avoid sudden spikes in blood glucose. This does not mean eliminating carbohydrates—you and your baby both need them. A registered dietitian can create a meal plan tailored to your needs, but general principles are: eat balanced meals and snacks every two to three hours, include a source of protein at each meal (eggs, fish, poultry, beans, nuts, or dairy), choose whole grains over refined ones, measure portion sizes of starchy carbohydrates, and eat plenty of non-starchy vegetables.
Fiber slows glucose absorption, so vegetables, whole grains, and legumes are helpful. Specific examples: Instead of white bread, choose whole wheat. Instead of juice, eat the fruit whole (the fiber helps). A meal of chicken, brown rice, and broccoli is better balanced than rice alone. A snack of an apple with peanut butter is better than crackers alone because the protein and fat slow how quickly glucose enters your bloodstream.
Avoid or limit sugary drinks, candy, desserts, and highly processed foods. These cause rapid blood glucose spikes and make management harder. Beer and wine also affect blood glucose and are not recommended during pregnancy in general. Some people find that certain carbohydrates, like white potatoes or sweetened cereal, spike their glucose more than others, so you will learn which foods affect *your* blood sugar.
Portion control matters even with healthy foods. A cup of brown rice is a different carbohydrate load than three cups. Your dietitian or educator will teach you how to recognize appropriate portions. Pregnancy does require eating more calories than before pregnancy, but gestational diabetes does not mean eating less—it means eating differently. Do not attempt to lose weight during pregnancy, even if you were overweight before.
Focus on stable blood glucose and appropriate weight gain for your pre-pregnancy weight. Your team will monitor both.
Monitoring Your Blood Sugar at Home
Once gestational diabetes is diagnosed, you will monitor your blood glucose using a home glucose meter. Your clinician will prescribe a meter and teach you how to use it. You prick your fingertip with a small lancet and test the blood drop on a test strip, which the meter reads in seconds. It is quick and causes minimal discomfort.
Most commonly, you check glucose before breakfast and two hours after the start of each main meal (breakfast, lunch, and dinner), for a total of four checks per day. Some people check more often or at different times depending on their patterns. Your clinician will tell you the target ranges for your fasting glucose and your after-meal (postprandial) readings.
These targets are typically lower in pregnancy than for non-pregnant people because protecting the baby's development matters. Keep a log of your readings or share them electronically with your clinic, usually weekly or every two weeks. Your team uses these readings to see if your current approach is working and whether diet, activity, or medication changes are needed.
Bring your meter and logbook to appointments. Some people feel anxious about checking their glucose multiple times a day. This is normal. The readings are information, not a judgment about you. High readings mean your current food or activity approach needs adjustment, not that you have failed. Many people find that after a few weeks, testing becomes routine.
If your glucose readings are mostly in the target range, your management is working. If several readings are above target, talk to your clinician about adjusting your diet, activity level, or starting medication. Do not change your diet drastically on your own without talking to your team.
When Insulin or Other Medication Is Needed
About 10 to 20 percent of people with gestational diabetes need insulin or another blood-glucose-lowering medication in addition to diet changes. This is not a failure of diet—it reflects the severity of your gestational diabetes and how much placental hormones are interfering with your insulin's function. Your clinician will recommend medication if your fasting glucose or after-meal readings remain above target despite dietary changes and activity.
Insulin is safe in pregnancy and does not cross the placenta in amounts that harm your baby. If you are prescribed insulin, you will learn to inject it yourself, usually before meals or at bedtime. Modern insulin pens are small and the needles are very thin. You will check your glucose more frequently once you start insulin to make sure your doses are right.
This does not mean you failed at diet—it means your body needs additional support. Some people are prescribed oral medications instead of insulin—typically metformin, which lowers glucose production by the liver. Metformin is well-studied in pregnancy and is considered safe. Like insulin, it is a tool to keep your blood sugar in the safe range.
Starting medication often feels like a step backward, but it is actually a step forward: it means your healthcare team has identified that your glucose needs more control and is providing it. Many pregnancies with gestational diabetes that required medication have excellent outcomes. Your clinician will adjust your insulin dose based on your glucose logs.
You might need more insulin as your pregnancy progresses and placental hormones increase, or your dose might stay stable. This is normal and expected.
What Gestational Diabetes Means for Your Pregnancy
Once gestational diabetes is diagnosed, you will have more frequent clinic visits than a typical pregnancy—often every two to four weeks instead of monthly. Your clinician will monitor your blood pressure, check your urine, and review your glucose logs. You may also have more frequent ultrasounds to check your baby's growth. High blood glucose can cause your baby to grow larger than typical for their age, a condition called macrosomia.
A larger baby increases the risk of complications during labor and delivery, including the possibility of shoulder dystocia (where the baby's shoulder gets stuck during birth) and the need for cesarean delivery. Keeping your glucose in the target range significantly reduces these risks. Gestational diabetes also slightly increases the risk of preeclampsia (high blood pressure in pregnancy) and polyhydramnios (excess amniotic fluid).
These are reasons for closer monitoring. Tell your clinician immediately if you develop severe headaches, vision changes, swelling, or sudden weight gain. Most babies born to people with well-controlled gestational diabetes are born at term and are healthy. The key is that your glucose is controlled, not that you have gestational diabetes itself. Stress and anxiety are common when managing gestational diabetes.
Your care team should offer support—whether that is access to a counselor, a support group, or just frequent check-ins with your diabetes educator. This is part of your care.
Labor, Delivery, and Birth
If your gestational diabetes is well-controlled, labor and delivery can proceed as planned for a low-risk pregnancy. You do not need to deliver early unless your clinician recommends it for other reasons. Most pregnancies with gestational diabetes deliver at term, around 40 weeks. During labor, glucose monitoring continues. You will check your blood glucose before labor begins and intermittently during labor, often every two to four hours.
If you are receiving insulin, your clinician will adjust your dose based on your glucose readings during labor because your insulin needs change once labor starts. If your baby was exposed to high glucose during pregnancy, your baby's blood glucose will be checked after birth and monitored for the first hours or days of life.
Newborns with very low glucose may need feeding support or an IV glucose infusion. This is routine monitoring and does not mean anything is wrong with your baby long-term. Gestational diabetes alone does not contraindicate vaginal delivery or change your birth plan unless other complications are present. If your baby is very large and your clinician is concerned about delivery complications, they may recommend cesarean delivery or labor induction before your due date. These are individual decisions made together with your care team.
Blood Sugar After Delivery
Your insulin resistance from pregnancy usually resolves within days to weeks after delivery. Most people find they no longer need insulin or glucose-lowering medication after birth. However, you need to be tested to confirm your glucose is normal again. A fasting glucose test or glucose tolerance test is typically done six to twelve weeks after delivery.
This test confirms that your glucose has returned to normal. Some people find their glucose remains abnormal and they are diagnosed with type 2 diabetes or prediabetes. This does not mean you still have gestational diabetes—it means you developed a separate glucose disorder that persists after pregnancy. If your postpartum test is normal, you have not developed diabetes.
However, people who had gestational diabetes have a higher risk of developing type 2 diabetes later in life (within 5 to 10 years or longer). Your clinician may recommend periodic glucose screening and lifestyle measures like maintaining a healthy weight and staying active to reduce this risk. If you have another pregnancy, tell your new care team about your gestational diabetes history.
You may be screened earlier or more frequently. Gestational diabetes often recurs in subsequent pregnancies, though not always. Breastfeeding is safe and encouraged. Breastfeeding can actually help lower your glucose and reduce your diabetes risk long-term.
Key Questions to Ask Your Care Team
When you are diagnosed with gestational diabetes, ask your clinician or diabetes educator: What are my target glucose ranges for fasting and after-meal readings? How often should I check my glucose? What specific diet changes do you recommend, and is there a dietitian I should see? Ask: What symptoms should prompt me to call you immediately? When should I schedule my next appointment? What is your plan if my glucose readings remain above target after two weeks of dietary changes? Will I need insulin, and if so, when do we start? Also ask: Are there restrictions on exercise or activity? Can I continue my current job or physical activities? What should I eat or drink if my glucose is low? How will my labor and delivery be affected? And: When will my glucose be tested after delivery? What does my risk look like for developing diabetes in the future? If I have another pregnancy, will I be screened differently? Your healthcare team should welcome these questions. You are the expert on your own body and your life, and they are the experts on managing gestational diabetes. Together, you create the plan that works.
Frequently Asked Questions
How common is gestational diabetes?
It is common enough that screening is offered to most pregnant people, usually in the second half of pregnancy. Many pregnancies are affected, and many people manage it successfully through diet alone.
Can gestational diabetes harm my baby?
Untreated high blood glucose can cause your baby to grow larger than typical and increase complications during labor. With good glucose control, risks are greatly reduced and most babies born to people with gestational diabetes are healthy.
Do I have to give myself insulin shots?
Not necessarily. Many people control gestational diabetes through diet and activity changes alone. If you need medication, insulin is safe in pregnancy. Your clinician will recommend it only if your glucose readings show you need additional help.
What happens to gestational diabetes after I deliver?
Gestational diabetes usually goes away within days to weeks after birth as your insulin resistance resolves. You will be tested six to twelve weeks after delivery to confirm your glucose is normal. Some people develop type 2 diabetes, which persists after pregnancy.
Can I prevent gestational diabetes in my next pregnancy?
Gestational diabetes often recurs in future pregnancies, though not always. Maintaining a healthy weight and staying active before and between pregnancies may reduce your risk. Tell your next care team about your history so they can monitor you appropriately.
What should I eat if I have gestational diabetes?
Eat balanced meals and snacks every two to three hours with a source of protein, healthy fat, and whole grains. Avoid sugary drinks, candy, and highly processed foods. A registered dietitian can create a plan specific to your needs and preferences.
