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That is a reading that is so low you would likely be unconscious and need emergency hospital treatment. If alert and able to swallow without choking, use a glucose tablet or sugar candy immediately and call 911 if you are diabetic and on oral hypoglycemic medications or insulin.

If you have no symptoms of sweating, shaking, agitation, dizziness or fainting which are common symptoms of hypoglycemia (low blood sugar) and if you are self-testing, it could only mean that your testing meter needs a battery or your strips are expired. Check those things and recheck your blood sugar, if still low seek urgent medical advice.

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13y ago
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7y ago

What we call fasting blood sugar or blood glucose levels is usually done six to eight hours after the last meal. So it's most commonly done before breakfast in the morning; and the normal range there is 70 to 100 milligrams per deciliter.

Now, when you eat a meal, blood sugar generally rises and in a normal individual it usually does not get above a 135 to 140 milligrams per deciliter. If it is only 20 for you, you need to see the doctor immediately as this is much too low. You can not really function at this level.

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Q: What do blood sugar readings at 20 mean?
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