What is the Insulin test?

The Insulin blood test measures the amount of insulin circulating in the bloodstream. Insulin is a hormone produced by the pancreas, essential for regulating blood glucose by allowing cells to absorb and use sugar for energy.

Insulin levels fluctuate in response to food intake, particularly carbohydrates. Measuring insulin—often alongside glucose—provides insight into how efficiently the body is managing blood sugar and whether insulin resistance may be present.

This test is commonly used in metabolic health assessment, diabetes risk screening, and investigation of abnormal blood sugar regulation.

Why do I need an Insulin test?

Abnormal insulin levels can indicate insulin resistance, early metabolic dysfunction, or disorders of insulin production. Testing helps identify problems before glucose levels become abnormal.

You may need an Insulin test if you:

• Have symptoms of insulin resistance
• Are at risk of type 2 diabetes
• Have unexplained weight gain
• Experience fatigue after meals
• Have polycystic ovary syndrome (PCOS)
• Have metabolic syndrome
• Want deeper insight beyond glucose or HbA1c

Symptoms or conditions linked to abnormal insulin levels include:

• Central (abdominal) weight gain
• Sugar cravings
• Post-meal fatigue
• Difficulty losing weight
• Irregular periods (PCOS)
• Elevated triglycerides

Benefits of the Insulin test

• Detects insulin resistance early
  Identifies metabolic issues before diabetes develops.
• Provides insight beyond glucose testing
  Insulin can be abnormal even when glucose is normal.
• Supports diabetes risk assessment
  Useful for prevention strategies.
• Relevant for PCOS assessment
  Insulin resistance is common in PCOS.
• Supports metabolic health optimisation
  Guides lifestyle and dietary interventions.
• Clinically recognised hormone test
  Used in endocrine and metabolic medicine.
• Useful for HOMA-IR calculation
  Combined with glucose for insulin resistance scoring.
• Simple blood test
  Requires only a single sample.

Step by step – how the test works

You can access Insulin testing UK-wide through two options:

1. Clinic appointment
   Choose your nearest UK clinic, where a healthcare professional will take your blood sample.
2. At-home or hotel visit (£60 extra)
   A qualified phlebotomist comes to your home or hotel, so you don’t need to travel.

Your sample is analysed in an accredited UK laboratory and results are delivered securely.

Your results explained

Low insulin levels

May indicate insufficient insulin production, seen in type 1 diabetes or advanced pancreatic dysfunction.

Typical UK interpretation (fasting):

• < 2 mIU/L

Normal insulin levels

Suggest effective insulin production and glucose regulation.

Typical UK interpretation (fasting):

• 2–25 mIU/L

High insulin levels

Often indicate insulin resistance, where the body produces excess insulin to maintain normal glucose.

Typical UK interpretation (fasting):

• > 25 mIU/L

Reference ranges depend on fasting status and laboratory methodology.