Blood sugar levels can be measured in different ways, and the normal range can vary slightly depending on the method used. Here are the normal blood sugar levels according to different sources:
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Fasting blood sugar test: A blood sample is taken after you havent eaten anything the night before (fast). A fasting blood sugar level less than 100 mg/dL (5.6 mmol/L) is normal. A fasting blood sugar level from 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is considered prediabetes. If its 126 mg/dL (7 mmol/L) or higher on two separate tests, you have diabetes.
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Random blood sugar test: A blood sample is taken at a random time. No matter when you last ate, a blood sugar level of 200 milligrams per deciliter (mg/dL) — 11.1 millimoles per liter (mmol/L) — or higher suggests diabetes.
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Glucose tolerance test: For this test, you fast overnight. Then, the fasting blood sugar level is measured. Then you drink a sugary liquid, and blood sugar levels are tested regularly for the next two hours. A blood sugar level less than 140 mg/dL (7.8 mmol/L) is normal. A reading of more than 200 mg/dL (11.1 mmol/L) after two hours means you have diabetes. A reading between 140 and 199 mg/dL (7.8 mmol/L and 11.0 mmol/L) means you have prediabetes.
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A1C test: This test measures your average blood sugar level over the past 2 or 3 months. An A1C below 5.7% is normal, between 5.7 and 6.4% indicates you have prediabetes, and 6.5% or higher indicates you have diabetes.
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Mean fasting blood glucose: The expected values for normal fasting blood glucose concentration are between 70 mg/dL (3.9 mmol/L) and 100 mg/dL (5.6 mmol/L) .
Its important to note that blood sugar levels can vary depending on factors such as age, weight, physical activity, and overall health. If you have concerns about your blood sugar levels, its best to consult with a healthcare provider.
