I get asked this question a lot, so here is the info!
People who have diabetes tend to have slightly higher blood glucose, or sugar, levels at around 80–180 milligrams per deciliter (mg/dL).
The Centers for Disease Control and Prevention (CDC) recommend that monitoring blood glucose levels helps people stay within their target ranges. Keeping in a healthy range can prevent long-term complications of diabetes, such as vision loss, heart disease, and kidney disease.
In this article, we discuss normal ranges for blood sugar levels. We also cover how and why doctors test blood sugar levels.
Blood sugar levels change throughout the day. Typically, blood sugar levels are at their lowest first thing in the morning or after a period of fasting. Blood sugar levels increase during and after meals, as the body digests food.
The following chart outlines normal blood sugar ranges for people with and without diabetes, depending on the time of day:
|Time of day||Target blood sugar for people without diabetes||Target blood sugar for people with diabetes|
|Before meals or while fasting||72–99 mg/dL | 3.9 – 5.5 mmol/l (rounded)||80–130 mg/dL | 4.4 – 7.2 mmol/l (rounded)|
|2 hours after the start of a meal||less than 140 mg/dL | 7.8 (rounded) mmol/l||less than 180 mg/dL | 10 mmol/l (rounded)|
|A1C results: Average over a 3-month period||less than 5.7%||less than 7%|
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