When to check blood sugar for prediabetes

Checking blood sugar

How do I check my blood sugar?

Use a blood sugar meter (also called a glucometer) or a continuous glucose monitor (CGM) to check your blood sugar.

A blood sugar meter measures the amount of sugar in a small sample of blood, usually from your fingertip. A CGM uses a sensor inserted under the skin to measure your blood sugar every few minutes.

If you use a CGM, you'll still need to test daily with a blood sugar meter.

This will help make sure your CGM readings are accurate.

When should I check my blood sugar?

How often you check your blood sugar depends on the type of diabetes you have and if you take any diabetes medicines.

Typical times to check your blood sugar are:

• When you first wake up, before you eat or drink anything.
• Before a meal.
• Two hours after a meal.
• At bedtime.

If you have type 1 diabetes, have type 2 diabetes and take insulin, or often have low blood sugar, your doctor may want you to check your blood sugar more often, such as before and after you're physically active.

Your blood sugar target

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how often should you check blood glucose levels

when should you test blood glucose levels