Gestational Diabetes Risk Check

Gestational diabetes (GDM) is high blood sugar that first appears during pregnancy, usually in the second half. Hormones from the placenta naturally make the body less sensitive to insulin; in most pregnancies the pancreas compensates, and in GDM it can't quite keep up. It's common — the CDC estimates it affects 2–10% of US pregnancies — and it usually goes away after delivery. It matters because untreated high blood sugar can lead to a larger baby, a harder delivery, and higher blood-pressure complications, all of which good treatment substantially reduces. A GDM diagnosis says nothing about anything you did wrong.

For everyone, at 24–28 weeks of pregnancy — this is universal in US prenatal care, recommended by ACOG and the USPSTF, whether or not you have a single risk factor. Most practices use a two-step approach: you drink a 50 g glucose drink (no fasting needed) and have blood drawn an hour later; only if that number runs high do you take the longer, fasting 100 g three-hour tolerance test that makes the actual diagnosis. Some practices use a one-step 75 g two-hour test instead. Either way, no one is skipped — the routine screen is the safety net under every risk estimate.

Early screening means checking blood sugar at the first prenatal visit instead of waiting for 24–28 weeks — usually with an A1c blood test or an early glucose test. ACOG and the ADA support it for people with a higher-risk pattern: a pre-pregnancy BMI of 25 or more (23 or more with Asian ancestry) plus at least one additional risk factor, gestational diabetes in a prior pregnancy, or known prediabetes. The point is to catch diabetes that predates the pregnancy or appears early. If the early test is normal, you still have the routine 24–28-week screen — nothing gets skipped.

No. Risk factors are population statistics — they shift probabilities, they don't decide outcomes. Most people with several risk factors never develop GDM, and a meaningful share of GDM happens in people with no classic risk factors at all, which is exactly why screening is universal rather than targeted. That's also the right way to read the ethnicity question: some groups show higher rates at the population level, shaped by many social and biological factors, but a group statistic is not a personal prediction. Risk factors only change one thing — whether an earlier test is worth asking about.

Yes — it's one of the most manageable pregnancy complications. Treatment typically starts with checking blood sugar at home, an eating plan worked out with your care team or a dietitian (this varies person to person, which is why no website should prescribe one), and physical activity your provider okays. If numbers stay high despite that, medication — most often insulin, which doesn't cross the placenta in meaningful amounts — brings them down. Managed well, the large majority of GDM pregnancies end with a healthy parent and baby. Afterward, a 4–12-week postpartum glucose test matters, because roughly half of people with GDM develop type 2 diabetes later — a risk that follow-up and lifestyle support genuinely reduce.

Yes. This check runs entirely in your browser: your answers are scored on your own device and are never sent to a server, saved, or shared — close the tab and they're gone. We treat reproductive and pregnancy data as sensitive by default, especially post-Dobbs, so there's no account, no tracking of your answers, and nothing to delete. It's general educational information based on published ACOG and ADA criteria; it isn't medical advice, a diagnosis, or a substitute for the screening conversation with your prenatal provider.