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Gestational Diabetes Screening: What the 2024-2026 ACOG and ADA Updates Mean

A pregnant woman seated calmly beside a small mixed-food bowl with a soft pastel line chart in the background, conveying nutrition-led screening and steady monitoring

Gestational diabetes (GDM) used to be screened on a standard schedule: an oral glucose tolerance test (OGTT) at 24-28 weeks of pregnancy, and a follow-up at 4-12 weeks postpartum to check for type 2 diabetes that developed during pregnancy. Most people skip that second screen. It's easy to miss when you have a newborn.

ACOG's 2024 Clinical Practice Update - reinforced by the American Diabetes Association's 2026 Standards of Care - changed both ends of that schedule. Pregestational screening is now recommended early in prenatal care for at-risk patients. Postpartum screening can happen at the delivery hospitalization, not weeks later. The shift is designed to catch undiagnosed diabetes before pregnancy complications, and to make sure GDM doesn't fall off the radar after birth.

What gestational diabetes actually is

Gestational diabetes is glucose intolerance that first appears during pregnancy. Around 7-14% of pregnancies in the US are affected - and the number is rising, tracking the increase in obesity and type 2 diabetes in reproductive-aged people.

The mechanism: placental hormones rise progressively through pregnancy, which raises insulin resistance. In most pregnancies, the pancreas keeps up by producing more insulin. In GDM, it doesn't, and blood sugar climbs. The pattern usually appears around 24 weeks - which is why standard screening happens at 24-28 weeks - but in many people, underlying type 2 diabetes was actually present before pregnancy and just hadn't been diagnosed.

What ACOG changed in 2024-2026

1. Pregestational diabetes screening before 24 weeks

For patients with risk factors, ACOG recommends screening for pregestational diabetes at the onset of prenatal care - before 24 weeks. The risk factors include:

If you fall in this group, the OGTT happens at your first prenatal visit, not at 24-28 weeks. That early result determines whether you have pre-existing type 2 diabetes (different risks and management than GDM) or whether you'll be re-screened at 24-28 weeks for true gestational diabetes.

2. No routine early screening for low-risk patients

For patients without risk factors, ACOG doesn't recommend early screening - the evidence didn't show benefit. The standard 24-28-week OGTT is still appropriate for them.

3. Postpartum screening can happen at delivery hospitalization

This is the change with the biggest practical impact. The old recommendation was an OGTT at 4-12 weeks postpartum to check for type 2 diabetes. Most people don't make it to that appointment - estimates put adherence under 50%.

ACOG now says clinicians may perform postpartum type 2 diabetes screening with a 75-gram OGTT during the delivery hospitalization for patients who had GDM during the pregnancy. You're already in the hospital. You're already getting glucose checks. Adding the formal screen at that moment is logistically simpler and dramatically increases the share of patients who actually get screened.

4. The ADA 2026 alignment

The American Diabetes Association's Standards of Care in Diabetes - 2026 (Section 15: Management of Diabetes in Pregnancy) reinforces the same approach: early screening for at-risk patients, GDM screening at 24-28 weeks for the rest, and postpartum screening pulled forward where feasible.

What this means for you

If you have risk factors

If you don't have risk factors

If you've had GDM in a prior pregnancy

What GDM management looks like

The standard approach is stepwise:

  1. Nutrition therapy with a registered dietitian - controlled carbohydrate distribution across meals and snacks, individualized to your readings
  2. Daily glucose monitoring - fingerstick four times a day (fasting plus after each meal) is typical
  3. Physical activity - 30 minutes most days, often walking after meals
  4. Medication - insulin is first-line if glucose targets aren't met with diet and exercise. Metformin is sometimes used but crosses the placenta and is less preferred per current ACOG/ADA guidance
  5. More frequent monitoring in the third trimester - growth scans, fetal kick counts, antenatal testing

Most people with GDM deliver healthy babies. The main risks of uncontrolled GDM are macrosomia (large baby, harder delivery), neonatal hypoglycemia, and an increased likelihood of preeclampsia.

What to do if you've been diagnosed

  1. Get a referral to a registered dietitian if it isn't automatic. The single most evidence-based intervention is structured nutrition therapy.
  2. Confirm your screening schedule. You'll likely have growth scans and additional check-ins through the third trimester. Bring questions about each.
  3. Track your glucose readings carefully. Patterns by meal and time of day matter more than individual numbers.
  4. Plan for postpartum screening. If your hospital offers the in-hospital OGTT, take it. If not, schedule the 4-12-week test before you leave.
  5. Watch for postpartum signs. Persistent thirst, fatigue, slow wound healing, or recurrent infections post-delivery deserve a glucose check - not "I'm just tired from the baby."

How Femora helps

Femora's pregnancy mode and tracking are designed for exactly this kind of dense, time-sensitive data:

For the broader pregnancy picture, see our Healthy Pregnancy Guide.

The bigger picture

The 2024-2026 GDM guideline updates are about closing two gaps: catching pre-existing diabetes in pregnancy before it complicates the birth, and catching post-pregnancy diabetes before it slips through the cracks. Both gaps were caused as much by logistics as by medicine - missed appointments, hard-to-schedule tests, and a system that assumed everyone could come back at 6 weeks postpartum. Moving the postpartum screen into the delivery hospitalization is a small structural fix that's expected to substantially increase screening rates. The broader lesson: making the right thing easier matters as much as making it possible.

Track your pregnancy week, symptoms, and glucose readings day-by-day with Femora. Free on iOS and Android.

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