Normal Variations in Blood Sugar During the Day

Controlling blood sugar levels is an important part of life for people with type 2 diabetes. The first step is knowing what's normal. So what is the normal variance in blood sugar during the day?

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Fasting blood sugar: this is the level that's measured after fasting (not eating) for 8 hours. Fasting sugar levels should normally be between 72-108 mg/dL (4 to 6 mmol/L). In people with diabetes, the target range is typically 72-126 mg/dL (4 to 7 mmol/L).
After a meal (postprandial blood sugar) In people without diabetes, it's normally 90 to 144 mg/dL (5 to 8 mmol/L). Good control for diabetics, two hours after a meal, is typically around 90-180 mg/dL (5 to 10 mmol/L).

Here is a summary of the variance using the numbers above:

	Fasting - Low Reading	Post-Prandial (2 hours) - High Reading	VARIANCE
Non-diabetic	72 mg/dL (4 mmol/L)	144 mg/dL (8 mmol/L)	72 - 144 mg/dL (4 - 8 mmol/L) A fluctuation of 72 mg/dL (4 mmol/L) over the course of the day
Diabetic	72 mg/dL (4 mmol/L)	180 mg/dL (10 mmol/L)	72 - 180 mg/dL (4 - 10 mmol/L) A fluctuation of 108 mg/dL (6 mmol/L) over the course of the day

The example above does not reflect your individual situation; diabetics should regularly monitor their blood sugar to ensure they stay within the target range set for them by their doctors. A comprehensive diabetes treatment plan can help you keep your glucose levels well-controlled. Some people will be able to control their diabetes without medication, while others may be prescribed medication or insulin to help with glucose control.

The information on this website is based on our own research and personal experience, and is not a substitute for medical advice. Questions about your health and individual situation should be directed to your doctor.