Insulin Resistance Blood Test in London

Fast and Accurate Insulin Resistance Testing

If you feel tired, gain weight easily, or struggle with sugar cravings, insulin resistance may be the cause.

At Marylebone Diagnostic Centre, we offer a professional and accurate Insulin Resistance (Fasting) blood test in London to help you understand your metabolic health.

• Same-week appointments available
• No GP referral required
• Clinical accuracy and clarity

Testing your insulin levels while fasting provides a critical insight into how your body manages glucose and identifies potential metabolic issues before they progress.

What Is an Insulin Resistance Test?

The insulin resistance test measures how well your body responds to insulin by combining two critical data points.

• Fasting Glucose: Measures the amount of sugar currently in your bloodstream after an 8–10 hour fast.
• Fasting Insulin: Measures the amount of hormone your pancreas is producing to manage your blood sugar.
• HOMA-IR Assessment: These results are used to estimate your insulin resistance (HOMA-IR), a key marker for early metabolic health.

HOMA-IR = (Fasting Insulin × Fasting Glucose) ÷ 22.5. This helps identify potential issues before diabetes develops.

Why This Test Matters

Insulin resistance can exist for years without clear symptoms. Many patients only discover this after testing.

Early detection helps you:

• Prevent type 2 diabetes
• Improve energy levels
• Manage weight more effectively
• Reduce cardiovascular risk

Unlike standard checks, this profile identifies metabolic dysfunction at a cellular level, allowing for proactive lifestyle adjustments.

Who Should Get Tested?

This test is ideal if you experience any of the following:

• Feel constantly tired or fatigued
• Struggle with weight gain or belly fat
• Experience sugar cravings
• Have a family history of diabetes
• Have PCOS or hormonal imbalance
• Want a full metabolic health check

Common Symptoms of Insulin Resistance

You may not notice symptoms early. However, some signs include:

• Low energy or brain fog
• Increased hunger or cravings
• Difficulty losing weight
• Darkened skin around neck or armpits (acanthosis nigricans)
• Hormonal imbalance

What Causes Insulin Resistance?

Several factors contribute:

• Excess abdominal fat
• Sedentary lifestyle
• High sugar or processed diet
• Chronic stress
• Poor sleep

Conditions linked to insulin resistance include PCOS, fatty liver disease and high blood pressure.

What Happens If It's Left Untreated?

Without intervention, insulin resistance may lead to:

• Type 2 diabetes
• Heart disease
• Stroke
• Hormonal disorders
• Fertility problems

This is why early testing is critical.

What Do the Results Mean?

Your results show how your body handles glucose and insulin.

• Normal: Good insulin sensitivity
• Elevated insulin: Early insulin resistance
• High glucose + insulin: Increased diabetes risk

Our team can guide you on next steps if needed.

Should You Combine This Test With Others?

For better insight, we recommend combining with:

• HbA1c (long-term blood sugar): Provides an average of your blood sugar levels over the past 2–3 months.
• Lipid profile (cholesterol): Essential for assessing cardiovascular health alongside metabolic markers.
• Liver function test: Screens for fatty liver, which is closely linked to insulin resistance.
• Thyroid function: Thyroid imbalances can often mimic or exacerbate metabolic symptoms.
• Vitamin D: Low levels are often associated with decreased insulin sensitivity.