If you’ve been diagnosed with gestational diabetes, you’ll typically check your blood sugar four times a day: once when you wake up (fasting) and once after each main meal. Your care team may adjust this schedule based on how well your numbers stay in range, but four daily checks is the standard starting point that most guidelines follow.
The Four Daily Checks
Each check serves a different purpose. Your fasting reading, taken first thing in the morning before eating or drinking anything, tells you how your body managed blood sugar overnight. The three post-meal readings show how your body responded to specific foods. You’ll check either one hour or two hours after meals, depending on what your provider recommends. “After a meal” means after your first bite, not after you finish eating.
The 2025 American Diabetes Association targets are:
- Fasting: below 95 mg/dL
- One hour after meals: below 140 mg/dL
- Two hours after meals: below 120 mg/dL
Your provider will tell you whether to use the one-hour or two-hour post-meal window. Most practices pick one and have you stick with it consistently so trends are easier to spot.
What If Your Numbers Are Well Controlled?
If you’re managing gestational diabetes with diet alone and your readings consistently stay in range, some providers will scale back to a less intensive schedule. One common approach is checking four times a day on just two days per week instead of every day. If two or more values exceed the targets during those check-in days, you’d go back to daily monitoring and your team would discuss next steps, which could include starting medication.
That said, many providers prefer daily monitoring throughout pregnancy regardless of how good your numbers look, because insulin resistance naturally increases as pregnancy progresses. A pattern that’s easy to control at 28 weeks can shift by 34 weeks. Consistent data gives your team early warning.
Why Fasting Numbers Are the Hardest to Control
Many people with gestational diabetes find that their post-meal numbers cooperate with dietary changes, but their fasting reading stays stubbornly high. This is usually caused by something called the dawn phenomenon. In the early morning hours, your body releases cortisol and growth hormone, which signal the liver to push out more glucose so you have energy to wake up. Normally, insulin keeps this surge in check. But with gestational diabetes, you either don’t produce enough insulin or your cells are too resistant to it, so blood sugar climbs overnight while you sleep.
A bedtime snack that pairs protein with a small amount of complex carbohydrates can sometimes help. An after-dinner walk also makes a difference for some people. But fasting numbers above 95 mg/dL that persist despite these strategies are one of the most common reasons medication gets added to the plan. If your bedtime reading is fine but your morning number is high, that overnight hormone surge is the likely culprit.
When Medication Changes the Monitoring Schedule
If your blood sugar regularly exceeds fasting or post-meal targets, your provider may start insulin or another medication. Once that happens, monitoring typically becomes more frequent and more structured. You’ll continue checking fasting and post-meal values, but your team may also ask you to test before meals or at bedtime to fine-tune dosing and watch for blood sugar dropping too low.
Insulin has traditionally been started when fasting levels exceed 105 mg/dL or two-hour post-meal readings exceed 120 mg/dL despite dietary management. Your provider uses the pattern in your log, not a single high reading, to make that call.
Tracking More Than Just the Number
A blood sugar reading by itself only tells part of the story. Recording what you ate, how much, when you ate it, and whether you were physically active gives your care team the context to make useful adjustments. A post-meal spike after a bowl of white rice tells a different story than the same spike after a well-balanced plate. Over a week or two, these notes reveal patterns that a column of numbers alone can’t show.
Many people use a simple notebook or a phone app with columns for the time, the reading, what they ate, and any activity. When you bring this to appointments, it turns a 15-minute visit into a much more productive conversation.
Ketone Testing
Some providers ask you to check for ketones, which are substances your body produces when it burns fat instead of glucose for energy. This can happen if you’re not eating enough carbohydrates or if your blood sugar is poorly controlled. The traditional approach is a urine ketone test before breakfast, but research shows that blood ketone testing catches more episodes of ketosis and that ketones can be present before lunch and dinner too, not just in the morning. Ask your provider whether ketone monitoring applies to your situation, especially if you’ve been significantly restricting carbs to keep your blood sugar down.
Continuous Glucose Monitors
Continuous glucose monitors, the small sensors worn on the arm or abdomen that read blood sugar every few minutes, are increasingly popular. They’re especially good at catching overnight highs and lows that finger sticks miss. However, the ADA currently considers the evidence insufficient to recommend them for all people with gestational diabetes. The decision to use one is individualized. If your provider does recommend a continuous monitor, it’s meant to supplement finger-stick checks, not replace them, because the calibration and accuracy still depend on periodic traditional readings.
That said, observational studies have found that continuous monitors detect more episodes of nighttime high blood sugar linked to larger birth weights, patterns that would go completely unnoticed with finger sticks alone. If you’re curious, it’s worth asking your care team whether one makes sense for your situation.
After Delivery: Testing Doesn’t Stop
Blood sugar typically returns to normal soon after the placenta is delivered, but up to 36% of people who had gestational diabetes still have abnormal glucose metabolism afterward. Current guidelines recommend a glucose tolerance test at six to twelve weeks postpartum to check whether the problem has resolved. After that, screening every three years is recommended for the rest of your life, because having gestational diabetes significantly raises your long-term risk of developing type 2 diabetes.
The postpartum test is a two-hour glucose tolerance test using a 75-gram glucose drink, or in some practices a simple fasting blood draw. It’s easy to let this slip in the chaos of new parenthood, but it’s one of the most important follow-up appointments on the calendar.