Blood sugar level–Definition

Blood sugar level, also known as blood glucose level, refers to the concentration of glucose (sugar) present in the blood. Glucose is a crucial source of energy for the body's cells and is particularly important for the brain's function. The body tightly regulates blood sugar levels to ensure they stay within a narrow range.

Normal blood sugar levels vary throughout the day, with the lowest levels typically occurring in the morning before the first meal (fasting) and higher levels after meals. The following are general guidelines for blood sugar levels:

  1. Fasting Blood Sugar:

    • Normal: Less than 100 mg/dL (milligrams per deciliter)
    • Prediabetes (impaired fasting glucose): 100 to 125 mg/dL
    • Diabetes: 126 mg/dL or higher on two separate tests

  2. Postprandial (After Meals) Blood Sugar:

    • Normal: Less than 140 mg/dL
    • Prediabetes: 140 to 199 mg/dL
    • Diabetes: 200 mg/dL or higher

Additionally, factors such as age, overall health, and other medical conditions can influence blood sugar levels. Monitoring blood sugar is essential for individuals with diabetes, as maintaining proper levels helps prevent complications.

Measuring blood sugar is typically done using a blood glucose meter, and results are often expressed in milligrams per deciliter (mg/dL) or millimoles per liter (mmol/L), depending on the country.



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