Gly LogWhen to check your blood sugar
Blood sugar changes many times a day, so when you checked matters as much as the number itself. Each time point tells you something different.
What each time point shows
| Time point | When | What it tells you |
|---|---|---|
| Fasting | After waking, 8+ hours without food | Overnight blood sugar, your baseline |
| Before meal | Right before lunch or dinner | Your starting point, the reference for after-meal checks |
| 1 hour after meal | 1 hour after your first bite | A value close to the peak |
| 2 hours after meal | 2 hours after your first bite | How well your blood sugar comes back down |
| Bedtime | Right before sleep | Overnight risk of lows or highs |
How many times a day?
It depends on the person. Whether you use insulin, which medications you take, and whether you are pregnant all change the recommendation, so the number your care team sets is your guide.
If you haven't been given a schedule, a common approach looks like this:
- One fasting check every morning
- A few days a week, check before and 2 hours after a meal as a pair to see how meals affect you
- If you feel shaky, sweaty, or unwell, check regardless of the time and log it as "Other" with a note
This article is general health information and does not replace diagnosis or treatment. Targets and how often to check differ from person to person, so follow your care team first. If you have symptoms of low blood sugar or readings far outside your range, contact your care team right away.
Reference: American Diabetes Association (ADA) Standards of Care
Last updated 2026-10-26