Library/Blood sugar/Fasting glucose/55

Fasting glucose of 55 mg/dLWhat it means, and what usually happens next

55mg/dL Fasting glucose
Low
5470100126

A fasting glucose of 55 mg/dL is under 70 mg/dL, the ADA's alert value for low blood sugar.

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Fasting glucose55mg/dL
In mmol/L3.1
The usual range70 to 99 mg/dL after at least 8 hours without food

What usually happens next

Plenty of healthy people read in the 60s after a long fast, especially lean and very active people, with no symptoms at all.

If you take medicine that lowers glucose, or you get shaky, sweaty or foggy between meals, bring it up with your doctor.

When a fasting glucose can read wrong

A fasting glucose only reads true after at least 8 hours without food or caloric drinks. Eating, a recent illness, steroid medicine, a hard workout the day before or a short night can push it up; a sample that sat for hours before it was spun can read lower, because the blood cells keep using the sugar.

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Questions

Is a fasting glucose of 55 mg/dL normal?

A fasting glucose of 55 mg/dL is under 70 mg/dL, the ADA's alert value for low blood sugar. The usual range is 70 to 99 mg/dL after at least 8 hours without food.

What is 55 mg/dL in mmol/L?

3.1 mmol/L. Labs in different countries print Fasting glucose in different units; the meaning is the same.

Is 55 mg/dL fasting glucose bad?

It depends on the band it falls in: under 100 mg/dL is normal, 100 to 125 is prediabetes and 126 or higher is the diabetes range, which a second test confirms.

Can coffee change a fasting glucose?

Black coffee has no sugar, but caffeine can nudge glucose up a little in some people; milk, sugar or syrups mean you weren't fasting.

Worked out by LifeFrom from the ADA Standards of Care, and not yet reviewed by a clinician. For your own understanding: only a lab test, read by your clinician, diagnoses anything.