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Metabolic

Fasting Insulin Test

Fasting insulin reveals metabolic efficiency and insulin sensitivity. Optimal levels support lean body composition, energy, and metabolic vitality.

Doctor's Assessment Included

Insulin (Fasting): what this test measures

This test measures baseline insulin levels in a fasting state. Elevated fasting insulin often precedes elevated fasting glucose, making it an early indicator of metabolic dysfunction.

Insulin (Fasting): why this value matters

Fasting insulin can detect insulin resistance years before diabetes develops. Early detection allows for lifestyle interventions that may prevent progression. Consult your healthcare provider for personalised advice.

Insulin (Fasting): how to prepare

  1. Pause biotin

    Required

    Do you take a supplement with biotin (vitamin B8, common in hair, skin and nail supplements)? Stop it 72 hours before the draw. Biotin interferes with the measurement of these values.

  2. 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.

Insulin (Fasting): when is testing worthwhile?

Testing may be recommended if you have risk factors for metabolic syndrome, PCOS, family history of diabetes, or unexplained weight gain, especially around the midsection.

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

Low Levels

Very low fasting insulin may indicate type 1 diabetes or advanced pancreatic insufficiency. Symptoms may include weight loss, excessive thirst, and frequent urination.

High Levels

Elevated fasting insulin may be associated with insulin resistance, weight gain, fatigue, sugar cravings, and difficulty losing weight. It is a key early marker of metabolic dysfunction.

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

Male

If Low

Low fasting insulin is normal and indicates good insulin sensitivity.

If High

Elevated fasting insulin indicates insulin resistance. Consider lifestyle changes and metformin.

Insulin (Fasting): lifestyle and this value

Regular exercise, especially resistance training and aerobic activity, can improve insulin sensitivity. Reduce refined carbohydrates, prioritise protein and fibre, and maintain a healthy weight.

Insulin (Fasting): frequently asked questions

What is insulin resistance?

Insulin resistance occurs when cells respond less effectively to insulin, causing the pancreas to produce more. It is an early stage of metabolic dysfunction that can lead to type 2 diabetes.

Can exercise lower fasting insulin?

Yes, regular physical activity, particularly resistance and aerobic exercise, can improve insulin sensitivity and lower fasting insulin levels over time.

Is fasting insulin better than fasting glucose for early detection?

Fasting insulin often rises before glucose does, making it potentially more sensitive for early detection of metabolic issues. Your healthcare provider can advise which tests are most appropriate.

Test Products

This marker is included in the following test panels.

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Insulin (Fasting)

€55,-