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A 23-year-old female asked:

Is 5.8 a high fasting blood sugar level? and how come after i eat, an hour later it's 4.0 and i feel a little off/ shakey? is this normal?

1 doctor answer4 doctors weighed in
Dr. Thomas Knecht
A Verified Doctoranswered
33 years experience
Slightly high: Hi. Yes, your fasting blood sugar is slightly high, but for diagnostics, you can't use finger stick glucose, you use serum glucose (drawn from a vein in your arm). Are you overweight/obese? If fasting serum glucose is 5.8 (or reproducibly above 5.5), you have prediabetes. You may be briskly secreting insulin in response to food intake, giving you your symptoms. Eat healthily and exercise regularly
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Last updated Nov 25, 2014

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