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Metabolic

Fasting Glucose: Normal Values and What a High Result Means

Fasting glucose monitors blood sugar regulation, which can be influenced by hormonal changes during the menstrual cycle, PCOS, pregnancy, and menopause.

Doctor's Assessment Included

Reference Ranges

Female
mmol/l
Low 3.5 Normal 5.5 High

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

Check your own value

Glucose (Fasting): what this test measures

This test measures blood glucose after fasting for at least 8 hours. It reflects your body's baseline ability to regulate blood sugar without the influence of recent food intake.

Glucose (Fasting): why this value matters

Fasting glucose is a cornerstone of metabolic health assessment. Elevated levels may indicate pre-diabetes or diabetes, while very low levels can also be clinically significant. Consult your healthcare provider for interpretation.

Glucose (Fasting): how to prepare

  1. Come fasting

    Required

    From 22:00 the evening before, eat and drink nothing except water. That is at least 8 hours. Skip coffee, tea, chewing gum and smoking that morning. Plan the draw before 10:00.

  • Water is always fine. Drink as usual beforehand, it makes the draw easier.
  • Take your usual medication, unless your own doctor told you otherwise.

Glucose (Fasting): when is testing worthwhile?

Testing is recommended as part of routine health screening, especially if you have risk factors such as family history of diabetes, overweight, physical inactivity, or a history of gestational diabetes.

Glucose (Fasting): symptoms of a high or low value

Low Levels

Low fasting glucose (hypoglycaemia) may cause shakiness, sweating, confusion, dizziness, rapid heartbeat, and in severe cases, loss of consciousness. Seek immediate medical attention for severe symptoms.

High Levels

High fasting glucose may initially cause no symptoms but over time can lead to increased thirst, frequent urination, fatigue, blurred vision, and slow wound healing.

Glucose (Fasting): what to do about an abnormal value

Female

If Low

Low fasting glucose may indicate hypoglycaemia. Consider evaluation.

If High

Elevated fasting glucose may indicate pre-diabetes or diabetes. Consider HbA1c testing.

Glucose (Fasting): lifestyle and this value

Maintain a balanced diet with controlled portions, regular physical activity, a healthy weight, and adequate sleep. Limit refined sugars and processed carbohydrates. These lifestyle factors play a key role in blood sugar management.

Glucose (Fasting): frequently asked questions

How long should I fast before this test?

You should fast for at least 8 hours before the test. Water is usually permitted. Follow your healthcare provider's specific instructions.

What fasting glucose level indicates diabetes?

Diagnostic thresholds vary by guideline. Your healthcare provider can interpret your results in context and advise on next steps if levels are elevated.

Can stress affect fasting glucose?

Yes, stress can temporarily raise blood sugar levels through cortisol release. If you were under significant stress during testing, discuss this with your healthcare provider.

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Glucose (Fasting)

€7,-