Metabolic
Glucose
LOINC 2345-7 · mg/dL
Ranges
Reference range: 70–100 mg/dLOptimal range: 70–90 mg/dL
What it is
Glucose is the sugar your body uses for energy. The blood-glucose test measures the amount circulating in your blood.
Why it matters
It is the central test for diabetes and blood-sugar control, and abnormal levels affect many aspects of health.
What high values can mean
A higher value can indicate prediabetes or diabetes, or a recent meal if the sample was not fasting.
What low values can mean
A lower value (hypoglycemia) can cause shakiness or dizziness and has several causes worth checking.
How to improve it
A diet lower in refined carbs and sugar, regular activity, weight management and good sleep support healthy glucose.
Food & lifestyle
Whole grains, vegetables, legumes and protein steady blood sugar; sugary drinks and refined carbs spike it.
Preparing for the testFasting required
For a fasting glucose, do not eat or drink anything but water for 8–12 hours beforehand — follow your lab.
When to talk to a doctor
Discuss a high fasting glucose with a doctor, who may confirm with HbA1c or repeat testing.
Related markers
Sources
- MedlinePlus (NIH)
- Testing.com (AACC)
Content reviewed on June 26, 2026
Medical disclaimer
This content is for educational purposes only. It is not medical advice and does not diagnose, treat, or prevent any condition. Reference ranges vary between laboratories — always use the range printed on your report and discuss your results with a healthcare professional.
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