- βReal-time CGM reduced large-for-gestational-age births by 68% compared to finger-stick testing
- βNo significant increase in serious adverse events with CGM use during pregnancy
- βFindings come from a rigorous, multinational randomized controlled trial of 375 women
| Journal | The lancet. Diabetes & endocrinology |
| Year | 2026 |
| Authors | Linder, Dressler-Steinbach, Wegener |
| PMID | 41308662 |
What Was Studied β and Why It Matters
Gestational diabetes (GDM) β diabetes that develops during pregnancy β raises the risk of delivering an unusually large baby, a condition called large-for-gestational-age (LGA). LGA births are linked to complicated deliveries, cesarean sections, and long-term health risks for both mother and child.
Researchers in Austria, Germany, and Switzerland ran a large, rigorous clinical trial called GRACE to answer one key question: does wearing a real-time continuous glucose monitor (rt-CGM) during pregnancy lead to better outcomes than the standard approach of finger-stick blood sugar checks (SMBG)?
What the Researchers Did
375 women diagnosed with gestational diabetes were randomly split into two groups. One group used a real-time CGM device β a small sensor worn on the body that tracks blood sugar around the clock β from enrollment until delivery. The other group used traditional finger-stick testing. Both groups received standard medical care. Researchers then compared how many babies were born too large.
What They Found
The results were striking:
- Only 4% of CGM users delivered a large-for-gestational-age baby, compared to 10% of finger-stick users β a 68% reduction in risk.
- Serious complications were similar between both groups, confirming that CGM did not introduce new safety concerns.
- One unexpected finding: slightly more babies in the CGM group were born small-for-gestational-age (SGA) β 19% vs. 13% β though this difference was not statistically significant. Researchers believe this may be linked to tighter blood sugar control and say it warrants further study.
Why Continuous Data Makes a Difference
Traditional finger-stick testing only captures blood sugar at specific moments β usually before and after meals. A real-time CGM gives expecting mothers and their care teams a continuous picture of glucose trends, including overnight spikes that finger-sticks would miss entirely. This fuller view allows for quicker adjustments to diet, activity, or medication.
For women managing gestational diabetes, having reliable, accurate supplies is essential. Whether you use a CGM system or rely on traditional glucose meters and test strips, MDS Diabetes carries the monitoring supplies needed to support your care plan throughout pregnancy.
What This Means for Patients
If you have been diagnosed with gestational diabetes, this study provides strong evidence that talking to your doctor about real-time CGM is worthwhile. The technology is not just a convenience β it may meaningfully reduce one of the most common complications of GDM. Ask your OB or endocrinologist whether CGM is appropriate for your situation and whether it is covered by your insurance during pregnancy.
Bottom Line
The GRACE trial is one of the clearest demonstrations yet that real-time continuous glucose monitoring can improve pregnancy outcomes for women with gestational diabetes. Compared to finger-stick testing alone, CGM reduced the chance of delivering an oversized baby by nearly 70% β without increasing safety risks. If you are navigating gestational diabetes, speak with your healthcare provider about whether CGM belongs in your care plan.