Gestational diabetes is high blood sugar that first shows up during pregnancy. Most pregnant people are screened for it with a blood test between 24 and 28 weeks, and sometimes earlier if certain risk factors are present. This guide explains how screening works, what ongoing management may involve, and why a follow-up test after delivery matters, so you know what to expect and what questions to bring to your prenatal visits.
Medical Disclaimer: This page is for general education only. It is not medical advice, diagnosis, or treatment, and reading it does not create a provider-patient relationship. Talk with a licensed healthcare provider about your specific situation. If you are having a medical emergency, call 911 or go to the nearest emergency room. See our full Medical Disclaimer.
Warning Signs to Act On Right Away
Gestational diabetes itself usually causes no noticeable symptoms, which is why screening matters. But call your provider promptly, or seek emergency care, if you notice any of the following during pregnancy or after delivery: severe or persistent headache, vision changes, sudden swelling in the face or hands, upper abdominal pain, confusion, extreme thirst with very frequent urination, or a blood glucose reading well outside the range your care team gave you. These can signal a complication that needs prompt attention, and only a clinician can evaluate them.
What Is Gestational Diabetes?
During pregnancy, the placenta produces hormones that make it harder for insulin to move glucose out of the blood and into cells, a change called insulin resistance. Most pregnant people make enough extra insulin to keep up. When the body can’t make enough, blood glucose rises, and that’s gestational diabetes.
It usually develops in the second half of pregnancy and typically resolves after delivery, once the placenta is gone and hormone levels return to their usual range. Because symptoms are often mild or absent, a blood test is the main way it’s found.
Who Gets Screened, and When
Most pregnant people are offered screening between 24 and 28 weeks of pregnancy. Earlier screening, sometimes in the first trimester, may be offered to people with certain risk factors, which can include a higher pre-pregnancy body mass index, a prior pregnancy with gestational diabetes, or a family history of diabetes. Whether earlier testing makes sense for you is a decision for your own prenatal care team based on your history.
Points to verify for Gestational Diabetes
- Ask when your provider recommends you be screened, and why that timing fits your situation.
- Ask which screening approach your clinic uses, and whether you need to fast beforehand.
- Ask what happens next if your first test result is high.
- Mention any personal or family history of diabetes at an early prenatal visit.
- Ask how results will be shared with you and how quickly.
How Screening Works
In the United States, clinicians commonly use one of two approaches. Your provider will tell you which one your practice uses.
- Two-step approach: First, a glucose challenge test, where you drink a sugary liquid and have your blood drawn one hour later without needing to fast. If that result is high, a longer oral glucose tolerance test follows, done while fasting, with blood drawn at intervals over two to three hours.
- One-step approach: A single oral glucose tolerance test done while fasting, with blood drawn before and at set times after drinking the glucose liquid.
A diagnosis is based on how many of the blood draws come back above the threshold your lab uses. Reference ranges and cutoff numbers vary by test and by lab, so ask your own provider to explain your specific results rather than comparing them to numbers you find online.
What Management May Involve
If you’re diagnosed with gestational diabetes, your care team will build a plan around your test results, your pregnancy, and your health history. General management commonly includes a mix of the following, though which pieces apply to you is a decision between you and your provider:
- A structured eating plan, often developed with a dietitian, focused on the timing and mix of carbohydrates, protein, and fat.
- Regular physical activity, as approved by your provider.
- Checking your own blood glucose at home with a meter at times your provider specifies.
- Additional fetal monitoring, such as growth ultrasounds, later in pregnancy.
- Medication, such as insulin, if eating and activity changes aren’t enough to keep glucose in the range your provider sets for you.
This page does not give individual glucose targets, meal plans, or medication guidance, because those depend on your test results, other health conditions, and your provider’s clinical judgment. Your care team will set numbers and a plan specific to you.
What remains uncertain about Gestational Diabetes
Some situations call for closer or different management, including a pregnancy with more than one fetus, a pre-existing health condition such as high blood pressure, or diabetes diagnosed before pregnancy rather than during it, which is a different condition with its own care pathway. This page describes general patterns in screening and management, not a personalized care plan, and it doesn’t cover every risk factor, medication option, or delivery consideration. A qualified prenatal care provider can review your full history against current clinical guidance.
Why Postpartum Follow-Up Matters
Gestational diabetes usually goes away after delivery, but having it raises the chance of developing type 2 diabetes later in life. Because of that, a follow-up blood test after delivery is a standard part of care for anyone diagnosed with gestational diabetes.
Current guidance calls for a glucose test in roughly the 4-to-12-week window after delivery. If that test is normal, ongoing retesting every one to three years is generally recommended, since the long-term risk doesn’t disappear once blood sugar returns to normal. Your own provider will tell you the exact timing and test they recommend for you.
Postpartum Follow-Up at a Glance
- Timing: A glucose test in the weeks following delivery, per your provider’s recommendation.
- Why: To check whether blood sugar has returned to a typical range.
- If normal: Periodic retesting over the following years, since future risk remains higher than average.
- If not normal: Your provider will discuss next steps, which may include referral for further evaluation or support.
Reader questions on Gestational Diabetes
Does gestational diabetes mean I’ll need insulin?
Not necessarily. Many people manage it with eating and activity changes alone. Insulin or other medication is added only if those steps aren’t enough to keep blood glucose in the range your provider sets, and that decision is made with your care team.
Will gestational diabetes go away after I give birth?
In most cases, blood sugar returns to a typical range once the placenta is delivered and pregnancy hormone levels drop. That’s why a postpartum test is still recommended, to confirm it and to check your longer-term risk.
Can gestational diabetes affect my baby?
It can, which is part of why screening and management matter. Specific risks and outcomes depend on individual factors, and your obstetric provider is the right person to walk through what applies to your pregnancy.
Am I at higher risk of diabetes later in life if I had gestational diabetes?
Yes, having gestational diabetes raises the chance of developing type 2 diabetes later on, which is why ongoing postpartum testing is recommended even after a normal result soon after delivery.
Educational Disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. It does not provide individualized glucose targets, meal plans, or medication guidance. Screening timing, diagnostic thresholds, and management plans vary by person and by clinical practice. Always consult a qualified healthcare provider about your specific pregnancy and health history.