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Hi there,This is Dr Basu, experienced Internal Medicine Specialist.I am here to address your concerns and provide great service.
Blood sugar cannot drop like that after a cup of coffee.
So your meter is likely malfunctioning.
Can be the strip problem or machine problem itself.
Better to get a new machine.
Besides one odd value is not conceerning even if accurate.
Your A1c is excellent which is a better measure preceding 3 month average blood sugar.
Do not worry.
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