Insulin Resistance Blood Test London
Fasting Insulin Resistance Test at 117a Harley Street, London, from £111.88, with results in 1 working day. The Fasting Insulin Resistance Index uses fasting insulin and glucose to provide an estimate of insulin resistance as part of wider metabolic assessment. Laboratory testing starts from £111.88.
Est. 1984
Trusted clinical caresince 1984
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The Fasting Insulin Resistance Index uses fasting insulin and glucose to provide an estimate of insulin resistance as part of wider metabolic assessment.
This test needs a 10 to 12 hour fast. Drink plain water only, and follow the clinic's advice about medicines unless you have been told otherwise.
Or call 0207 499 1991.
Your test option
Select a profile to see every included analyte before you book.
What does the FIRI test measure?
The Fasting Insulin Resistance Index combines fasting glucose and fasting insulin into a calculated FIRI score. Metabolic risk assessment belongs with wider diabetes risk factors and lifestyle context.
This test requires fasting. The result is interpreted with HbA1c, lipids, blood pressure, symptoms and clinical history.
Fasting Insulin Resistance Index (FIRI)
Fasting Insulin Resistance Index (FIRI)
FIRI · £111.88
Analytes: Fasting glucose; Fasting insulin; FIRI calculation
Turnaround: Usually 1 working day
- •Fasting glucose: blood sugar after the required fast
- •Fasting insulin: insulin level after the same fast
- •FIRI calculation: derived index estimating insulin resistance
FIRI is not a standalone assessment of diabetes. An HbA1c test is often requested alongside it.
Have a doctor review your insulin resistance result
A fasting insulin resistance index is not a diagnosis on its own. It is read with HbA1c, lipids, blood pressure, weight and your history. A private GP can explain what the figure means for your risk of type 2 diabetes and agree what to do about it.
The doctor can also say whether HbA1c or a lipid profile should be taken at the same visit.
- •Book a GP consultation first if you are unsure whether you need this test, HbA1c or both
- •The report is usually ready within 1 working day
- •Book a follow-up consultation to go through the result and agree the next step
GP Consultation
£150
Discuss weight, family history of diabetes, PCOS or a previous borderline sugar result, and agree which tests to request.
Follow-Up Consultation
£100
For existing patients: go through your result with a doctor and agree the next step.
Only need the laboratory test? Our sister clinic lists the insulin resistance blood test at Blood London.
Metabolic risk, family history and PCOS
- •Metabolic-risk assessment after clinical discussion
- •Family history of type 2 diabetes
- •Polycystic ovary syndrome (PCOS) or other insulin-resistance concerns being assessed clinically
- •Monitoring a clinician-led metabolic plan
How to prepare for FIRI
A 10 to 12 hour fast is required. Drink plain water only, unless the clinic gives different advice about medicines.
A morning sample is preferred where possible. Mention medicines that affect glucose or insulin when you book. The report is usually ready within 1 working day.
What a FIRI score estimates
- •FIRI is not a standalone diagnosis of diabetes.
- •Results must be interpreted with HbA1c, lipids, blood pressure, symptoms and clinical history.
Usually 1 working day. Your laboratory report is supplied securely.
The blood-test price covers the laboratory report, not a consultation. A separate GP consultation is £150 if you want a doctor to interpret the result with your symptoms and history.
Urgent care is the safer first step when there is confusion, vomiting with inability to keep fluids down, or another symptom of acute illness affecting glucose.
HbA1c is the more useful first or companion test when longer-term glucose control is the main question.
Source: NICE type 2 diabetes prevention.
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Sources & References
- Metabolic risk assessment should be considered with wider diabetes risk factors and lifestyle context. - NICE type 2 diabetes prevention[Link]
Dr Penny Sheehan
Health Screening, Paediatrics and Menopause • GMC 6056535
“Dr Sheehan works in women's health, menopause care and health screening. She has training and experience in weight management, including GLP-1 receptor agonist prescribing, and a special interest in paediatric assessment.”
Service information reviewed 26 August 2026.
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What our patients say
“Quick, painless draw and 4-hour results”
“Had an appointment at 1:30 PM but got there early and the staff were happy to draw my blood earlier since there was availability. Quick and painless process with a professional phlebotomist. The turnaround time stated on the website for the test was 4 hours, and sure enough, I received my results super easy with no issues. Would recommend this service.”
“Heard, understood and reassured”
“The clinic is warm and welcoming. In my experience, every time I was there, I found myself heard and understood. My health issues have been tackled in the best of ways. Miss Arjeta is absolutely a master of blood tests, you will not feel anything. Dr Bakhtiar is knowledgeable and calm, I always feel reassured after speaking to him. I genuinely recommend this clinic.”
“Results faster than expected at a walk-in clinic”
“I recently had a blood test for rabbit allergies at Medical Express Clinic, and I'm extremely pleased with the service. Not only did I receive my results faster than expected, but the receptionist was fabulous, she answered all my questions and accommodated all my requests. It's the only walk-in clinic I found in central London with reasonable prices. Highly recommend this clinic!”
Common questions
How long must I fast?
10 to 12 hours, with plain water only, unless the clinic gives different advice about medicines.
Does FIRI diagnose diabetes?
FIRI estimates insulin resistance. It is not a diabetes diagnosis and is interpreted with other clinical information.
Can a doctor go through my result with me?
A private GP consultation is £150, and a follow-up consultation for existing patients is £100. The doctor reviews the result alongside your symptoms and agrees the next step.
