How often you should test your blood sugar depends almost entirely on the type of diabetes you have and how you treat it. Someone with Type 1 diabetes on insulin may need to check 6 to 10 times a day, while someone managing Type 2 with diet alone may not need daily testing at all. Here’s what the guidelines recommend for each situation.
Type 1 Diabetes
If you have Type 1 diabetes, blood sugar testing is part of nearly every decision you make throughout the day. The 2025 ADA Standards of Care recommend checking when fasting, before and after meals, at bedtime, overnight, during exercise, whenever you suspect a low or high, and before critical tasks like driving. In practice, that often means 6 to 10 fingerstick checks per day for people not using a continuous glucose monitor.
Many people with Type 1 now use continuous glucose monitors (CGMs), which take a reading every few minutes and largely eliminate the need for routine fingersticks. Current-generation CGMs are factory calibrated, so most don’t require fingerstick checks to confirm their readings. You may still need a manual check if the sensor gives an extreme reading that doesn’t match how you feel, or if the sensor is in its first hours after insertion.
Type 2 Diabetes on Insulin
If you take insulin to manage Type 2 diabetes, your testing schedule looks similar to Type 1 in many ways. You’ll typically check fasting levels each morning and test at various points throughout the day to see how meals, activity, and your insulin doses affect your blood sugar.
Testing is especially frequent when you’re starting insulin or adjusting your dose. During that titration period, you might check your fasting glucose daily (or even average three consecutive days of fasting readings) to help fine-tune how much insulin you need. Once your dose stabilizes and your A1C is on target, your doctor will likely scale back how often you need to test. The key principle is that testing frequency should match how actively your treatment is changing.
Type 2 Diabetes Without Insulin
If you manage Type 2 diabetes with non-insulin medications, diet, or exercise, you may not need to test every day. The Mayo Clinic notes that daily monitoring often isn’t necessary for this group. Your doctor will tailor a schedule based on how well-controlled your blood sugar is and what medications you take.
That said, there are times when even people in this group should test more frequently: when you’re sick, before a long drive, or when you’ve made significant changes to your diet or exercise routine. These are all situations where your blood sugar can shift unpredictably.
Gestational Diabetes
Gestational diabetes requires one of the most structured testing schedules. The ADA recommends checking fasting blood sugar plus levels after each meal, which typically means four tests per day at minimum. The targets are specific:
- Fasting: below 95 mg/dL
- One hour after a meal: below 140 mg/dL
- Two hours after a meal: below 120 mg/dL
Your provider will tell you whether to test at the one-hour or two-hour mark after eating. If you’re on an insulin pump or a basal-bolus insulin regimen during pregnancy, you’ll also check before meals so your pre-meal insulin dose can be adjusted. This intensive monitoring usually continues until delivery.
When to Test Around Meals
For people who track post-meal blood sugar, timing matters. Testing one hour after your first bite captures the peak of your blood sugar spike for most meals. Testing at the two-hour mark shows how quickly your body is clearing glucose back toward baseline. Your doctor’s recommendation will depend on what information is most useful for your treatment plan.
If you’re trying to learn which foods spike your blood sugar the most, the one-hour reading tends to be more revealing. If you’re monitoring overall glucose control or adjusting medication, the two-hour reading is often what your provider wants to see.
Testing During Illness
When you’re sick with a cold, flu, infection, or stomach bug, your blood sugar can rise sharply even if you’re not eating much. The CDC recommends testing every 4 hours during illness and writing down the results. This applies whether you have Type 1 or Type 2 diabetes. Illness-related stress hormones push blood sugar up, and dehydration from fever or vomiting can concentrate glucose in your blood. Resume your normal testing routine once you’ve recovered and your readings stabilize.
Testing Around Exercise
If you take insulin or medications that can cause low blood sugar, check your levels 15 to 30 minutes before you start exercising. For longer workouts, test every 30 minutes during the activity. Then check again right after you finish and periodically over the next several hours. Blood sugar can continue to drop well after exercise ends because your muscles keep pulling glucose from your bloodstream to replenish their energy stores.
People who don’t take insulin or hypoglycemia-causing medications generally don’t need to test around exercise unless their doctor has specifically recommended it.
Troubleshooting High Morning Blood Sugar
If you consistently wake up with elevated blood sugar, your doctor may ask you to test in the middle of the night, typically between 2 and 3 a.m. This helps distinguish between two different causes. The dawn phenomenon is a natural rise in blood sugar that happens in the early morning hours due to hormonal shifts. Rebound hyperglycemia (sometimes called the Somogyi effect) happens when blood sugar drops too low overnight, usually from too much insulin, and your body overcorrects by releasing stored glucose.
A 2 to 3 a.m. check reveals which pattern is at play. If that middle-of-the-night reading is low, the morning spike is likely a rebound. If it’s normal or already trending upward, you’re dealing with the dawn phenomenon. A CGM can capture this entire overnight trend automatically, which is one reason providers often recommend it for people with unexplained morning highs.
Prediabetes
If you have prediabetes, there are currently no consensus guidelines recommending routine home blood sugar monitoring. Your doctor will typically track your status through periodic lab work, including fasting glucose and A1C tests, usually every 6 to 12 months. Some people with prediabetes choose to use a CGM briefly to understand how their body responds to different foods and activity levels, but there are no established targets or metrics for CGM use in prediabetes yet.
CGM vs. Fingerstick Testing
Continuous glucose monitors have fundamentally changed how often people need to prick their fingers. A CGM sensor sits just under the skin and measures glucose levels in the fluid between your cells, transmitting a new reading every one to five minutes. That means hundreds of data points per day compared to the handful you’d get from fingersticks.
For anyone checking four or more times daily, a CGM can reduce fingerstick burden dramatically. Most current devices don’t require any calibration fingersticks at all. The tradeoff is cost and access. Not every insurance plan covers CGMs, particularly for people with Type 2 diabetes who aren’t on insulin. If you’re doing frequent fingersticks and finding it burdensome, it’s worth asking your provider whether a CGM is an option for your situation.