Monitoring gestational diabetes involves testing your blood sugar four times a day, keeping a detailed log, and attending regular prenatal check-ins so your care team can adjust your plan as needed. The goal is to keep your fasting blood sugar below 95 mg/dL and your post-meal readings below 140 mg/dL (at one hour) or 120 mg/dL (at two hours). Most of the monitoring happens at home, on your own, with a glucose meter and test strips.
Daily Blood Sugar Testing
The standard recommendation is to check your blood sugar four times per day. The first test is a fasting reading, taken first thing in the morning before eating anything. The other three are taken after each meal: breakfast, lunch, and dinner. Your provider will tell you whether to test one hour or two hours after your first bite, and your target changes depending on which window you use. At one hour post-meal, you’re aiming for under 140 mg/dL. At two hours, the target drops to under 120 mg/dL.
These numbers come from the American Diabetes Association’s current standards of care. They’re not loose guidelines. Consistently exceeding them raises the risk of complications like a larger-than-expected baby, preeclampsia, or the need for a cesarean delivery. If you’re on insulin, your provider may also set lower limits for your targets to help avoid blood sugar dropping too low. For insulin-treated gestational diabetes, a safe fasting range is typically 70 to 95 mg/dL, and post-meal targets have corresponding lower bounds as well.
What to Record in Your Log
A blood sugar number by itself doesn’t tell the full story. Your log should also capture what you ate, how much, when you ate it, and any physical activity around that time. Stress and sleep quality also affect blood sugar, so noting those patterns helps your care team spot trends that a list of numbers alone would miss. If you walked for 20 minutes after lunch and your reading came back lower than usual, that’s useful information. If you ate the same breakfast two days in a row but got very different numbers, your notes might reveal what changed.
This log is the main tool your provider uses to decide whether your current plan (diet, exercise, or medication) is working. The more context you provide, the more precisely they can adjust things.
How Often You’ll See Your Care Team
Expect prenatal visits every two to three weeks once you’re diagnosed. At these appointments, your provider reviews your blood sugar log, checks for patterns, and decides whether any changes are needed to your diet or treatment. If your numbers are running high or you’ve started medication, your logs may be reviewed weekly, either in person or through a patient portal or phone check-in.
These visits are also when your provider tracks your weight gain, blood pressure, and overall pregnancy health alongside your glucose data. Gestational diabetes management isn’t just about the numbers on your meter. It’s about how those numbers fit into the bigger picture of your pregnancy.
Fetal Monitoring During Pregnancy
Your baby’s health is monitored more closely when you have gestational diabetes. Starting around 32 weeks, your provider may order additional ultrasounds to check your baby’s growth and amniotic fluid levels. A growth ultrasound is commonly done between 34 and 36 weeks to assess whether the baby is measuring larger than expected, which is one of the main concerns with elevated blood sugar during pregnancy.
From 36 weeks onward, many providers begin weekly non-stress tests. During this test, a monitor tracks your baby’s heart rate for about 20 to 30 minutes while you sit or recline. The goal is to see the heart rate rise with movement, which is a sign of a healthy baby. If anything looks unusual, your provider may repeat the test twice a week or order a biophysical profile, which combines the heart rate monitoring with an ultrasound to evaluate the baby’s breathing movements, muscle tone, and fluid levels.
Your provider may also ask you to do daily kick counts at home starting in the third trimester. This simply means picking a time each day, often after a meal when the baby tends to be active, and counting how long it takes to feel 10 movements.
Continuous Glucose Monitors
Continuous glucose monitors, the small sensors worn on the arm or abdomen that track blood sugar every few minutes, are increasingly common in diabetes care. However, standardized targets for CGM use have only been established for type 1 diabetes in pregnancy, not for gestational diabetes. There simply isn’t enough data yet to set official CGM benchmarks for gestational diabetes management.
Some providers do use CGM as a supplementary tool alongside finger-stick testing, especially if your numbers are hard to control or you’re on insulin. But finger-stick readings remain the primary method for making treatment decisions. If you’re using a CGM, your provider will still likely ask you to confirm important readings, particularly fasting values and any surprisingly high or low results, with a traditional finger prick.
When Ketone Testing Matters
Your provider may ask you to check for ketones in your urine under certain circumstances. Ketones are produced when your body burns fat instead of sugar for energy, which can happen if you’re not eating enough carbohydrates or if your blood sugar is running very high. During pregnancy, elevated ketone levels are a concern because they can affect fetal development.
Ketone testing isn’t part of the daily routine for most people with gestational diabetes. It’s typically recommended if your blood sugar is unusually high without a clear explanation, if you’re vomiting or unable to keep food down, or if you have a fever. Your provider may give you at-home urine test strips and tell you the specific situations in which to use them.
Why A1c Plays a Limited Role
You might wonder why your provider doesn’t just use an A1c test, the blood test that reflects average blood sugar over about three months, to track your gestational diabetes. The reason is that pregnancy changes your blood volume and red blood cell turnover in ways that make A1c less reliable. An A1c drawn during pregnancy can underestimate your actual blood sugar levels.
A1c does have a role in early pregnancy as a screening tool. Testing between 10 and 12 weeks can help identify people at highest risk before the standard glucose tolerance test at 24 to 28 weeks. But for ongoing management, daily finger-stick readings give a much more accurate and actionable picture of how your blood sugar responds to specific meals and activities. A1c is too slow and too blunt an instrument for the kind of fine-tuned adjustments gestational diabetes requires.
Postpartum Screening
Gestational diabetes usually resolves after delivery, but it significantly increases your risk of developing type 2 diabetes later in life. For this reason, you should be screened again between 6 and 12 weeks after giving birth. This screening is either a fasting blood sugar test or a two-hour oral glucose tolerance test using a 75-gram glucose drink.
Many people skip this follow-up appointment in the chaos of new parenthood, but it’s one of the most important steps in the entire process. Catching prediabetes or early type 2 diabetes at this stage gives you the best chance of reversing it through lifestyle changes before it becomes a long-term condition.