Blood Glucose (Random)
Blood glucose measures the amount of sugar (glucose) circulating in your bloodstream. Glucose is the body's primary energy source, derived from carbohydrates in food. Random glucose can be tested at any time regardless of meals and is used for initial diabetes screening. For a definitive diagnosis, fasting glucose or HbA1c is preferred.
Reference Ranges
Male
70 – 140
mg/dL
Female
70 – 140
mg/dL
Child
70 – 140
mg/dL
Ages 2–18
Reference ranges may vary by laboratory. Always compare with the range printed on your lab report.
What Low Levels Mean
Low blood sugar (hypoglycemia) causes shakiness, sweating, confusion, irritability, and rapid heartbeat. In severe cases it can cause seizures or unconsciousness. Common causes include skipping meals, excess insulin or diabetes medication, alcohol, and intense exercise.
What High Levels Mean
High blood sugar (hyperglycemia) above 200 mg/dL with symptoms is diagnostic of diabetes. Persistent high glucose damages blood vessels, nerves, kidneys, and eyes over time. Causes include diabetes, stress, infections, and certain medications like steroids.
Frequently Asked Questions
What is a normal random blood sugar?
A random blood sugar below 140 mg/dL is normal. Between 140–199 mg/dL is suggestive of prediabetes or postprandial elevation. A random reading of 200 mg/dL or above, with diabetes symptoms, is diagnostic of diabetes.
Why is fasting glucose more accurate?
Fasting glucose removes the variable of recent meals, giving a baseline reading. Random glucose can be elevated simply because you ate recently. That's why doctors prefer fasting glucose or HbA1c for diagnosing diabetes.
Can stress raise blood sugar?
Yes. Stress hormones (cortisol, adrenaline) release stored glucose into the bloodstream. This is a normal 'fight or flight' response but can cause temporary spikes. Chronic stress can contribute to insulin resistance over time.
This information is for educational purposes only and should not replace professional medical advice. Always consult your doctor for interpretation of your test results.
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