BloodGlucoseValueUnderstand every reading

Blood Glucose 629 mg/dL tested - is it bad?

HImg/dL34.9 mmol/L
  • Without diabetes, fastingDiabetes range
  • Without diabetes, 2 h after eatingDiabetes range
  • With diabetes, before a mealVery high
  • With diabetes, after a mealVery high
  • In mmol/L34.9 mmol/L

Get medical advice now

  • Check ketones if you use insulin. Moderate or high ketones, vomiting, abdominal pain, deep fast breathing or fruity-smelling breath can mean diabetic ketoacidosis — call 911 (US) or your local emergency number or go to the emergency room.
  • Very high readings (especially above 600 mg/dL, often shown as "HI") with extreme thirst, confusion or drowsiness can mean hyperosmolar hyperglycemic state — an emergency.
  • With diabetes and none of these signs: contact your care team today and re-check every 2–3 hours.
  • Without known diabetes: see a doctor today — and if you feel unwell (vomiting, very thirsty, drowsy), treat it as an emergency: call 911 (US) or your local emergency number.

If you don't have diabetes

629 mg/dL is in the diabetes range whether fasting or after a meal. A random reading of 200 mg/dL or more together with typical symptoms (thirst, frequent urination, weight loss) is enough for a diagnosis — see a doctor today. If you feel unwell (vomiting, very thirsty, drowsy), it is an emergency: call 911 (US) or your local emergency number.

Fasting (8+ hours without food)

Diabetes rangeScale with 629 mg/dL marked5570100126629 mg/dL (off scale)

2 hours after eating (or glucose tolerance test)

Diabetes rangeScale with 629 mg/dL marked5570140200629 mg/dL (off scale)

If you have diabetes

629 mg/dL is very high. Check ketones if you use insulin and contact your care team today. With moderate or high ketones, vomiting, abdominal pain, deep fast breathing, extreme thirst, confusion or drowsiness, call 911 (US) or your local emergency number (see the box above).

Before a meal / fasting

Very highScale with 629 mg/dL marked547080>130>180>240300629 mg/dL (off scale)

1–2 hours after a meal

Very highScale with 629 mg/dL marked5470180>240300629 mg/dL (off scale)

Targets 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.

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 629 mg/dL that means roughly 535–723 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 · ADA: Hyperglycemia · MedlinePlus: Diabetic ketoacidosis · 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.