Blood Glucose 10 tested - mmol/L or mg/dL?
Most meters outside the US show mmol/L. A reading of 10 is far more likely to be 10 mmol/L than 10 mg/dL.
If it is 10 mmol/L
= 180 mg/dL. Fasting without diabetes: Diabetes range · With diabetes before a meal: Above target
Full explanation for 180 mg/dL →If it really is 10 mg/dL
That is 0.6 mmol/L — severely low, below the level 2 hypoglycemia threshold of 54 mg/dL (3.0 mmol/L). Most meters show "LO" below 20 mg/dL. If the person is shaky, sweaty, confused or drowsy, treat it as a severe low: 15–20 g of fast-acting carbohydrate if they can swallow safely; if not, glucagon if available, recovery position and call 911 (US) or your local emergency number.
Full explanation for 10 mg/dL →Not urgent — but follow up
- Without diabetes: this is above normal both fasting and 2 hours after eating — ask your doctor for an HbA1c or a glucose tolerance test.
- With diabetes: above target before and after meals. Look at the pattern over several days and discuss it at your next review.
- Note the time and whether you had eaten — the same number means different things fasting and after a meal.
If you don't have diabetes — reading 10 mmol/L (180 mg/dL)
Two hours after eating, 10 mmol/L (180 mg/dL) is in the prediabetes range (7.8–11.0 mmol/L = 140–199 mg/dL); fasting it would be in the diabetes range. Have your doctor check an HbA1c or a glucose tolerance test.
Fasting prediabetes cut-off: the ADA uses 5.6 mmol/L (100 mg/dL); the WHO uses 6.1 mmol/L (110 mg/dL). This site follows the ADA.
Fasting (8+ hours without food)
Diabetes range2 hours after eating (or glucose tolerance test)
Prediabetes rangeIf you have diabetes — reading 10 mmol/L (180 mg/dL)
10 mmol/L (180 mg/dL) is high — above both targets. Common causes: a carb-heavy meal, a missed or too-small dose, illness, stress or less activity than usual.
Before a meal / fasting
Above target1–2 hours after a meal
Above targetTargets for most non-pregnant adults (American Diabetes Association (ADA) Standards of Care). Your own targets may be different — for example in pregnancy, for children, older adults or people prone to lows. See pregnancy targets.
180 mg/dL as an average: HbA1c 7.9%
If 180 mg/dL were your average glucose over two to three months, it would match an HbA1c of about 7.9% (above the common treatment goal of below 7%). A single reading says little about your HbA1c — it is the long-term average that counts. Learn more in how to measure blood sugar.
Make sure the number is right
- Wash and dry your hands before a finger-stick: fruit juice or sugar on the skin can raise the result a lot.
- Home meters may differ from a lab value by up to about 15%. At 180 mg/dL that means roughly 153–207 mg/dL.
- CGM sensors measure tissue fluid and lag 5–15 minutes behind blood when glucose changes quickly — confirm lows with a finger-stick.
Check another reading
Nearby values
Sources: ADA Standards of Care · ADAG study (HbA1c and average glucose) · WHO: Definition and diagnosis of diabetes · MedlinePlus: Blood glucose test
This page explains one reading in general terms. It is not a diagnosis or a treatment instruction. Follow the plan agreed with your doctor or diabetes team.