Diabetes & Prediabetes Screening London 2026: The Complete Guide to HbA1c Testing, Insulin Resistance Assessment and Metabolic Health
Reviewed by the medical team at The Online GP by The Wellness | Last updated: April 2026 | GMC-registered doctors | clinic | 10 Portman Square, Marylebone, London W1H 6AZ
At a glance
The Online GP by The Wellness offers private diabetes and prediabetes screening in London from £45 for a standalone HbA1c blood test, £195 for a comprehensive diabetes blood panel, and £395 for the full Comprehensive Diabetes & Metabolic Health Package combining a GP consultation, comprehensive bloods, urine testing, blood pressure, and clinical foot examination. Same-day appointments are usually available, with results typically within 24 to 48 hours. The pathway aligns with the NICE 2026 updated guidance on type 2 diabetes management.
Book today: WhatsApp +44 7961 280835 | Email team@thewellnesslondon.com | Call 020 3951 3429
Why does diabetes screening matter so much in 2026?
Diabetes is one of the largest, fastest-growing health challenges in the UK. According to Diabetes UK and NHS Digital, approximately 4.7 million UK adults have a diagnosed diabetes condition, with rates expected to reach 5.5 million within the next decade. An additional 6 to 7 million UK adults are estimated to have prediabetes (raised blood glucose not yet meeting diabetes criteria), and Public Health England data suggest a substantial proportion remain undiagnosed.
The reason this matters is that prediabetes and early type 2 diabetes are largely silent. The classic symptoms (excessive thirst, frequent urination, unexplained weight loss, fatigue, blurred vision, recurrent infections) often appear only when blood glucose has been elevated for years and complications are already developing. By the time of formal diagnosis, around half of patients with type 2 diabetes already have evidence of one or more complications: cardiovascular disease, kidney disease, retinopathy, or neuropathy.
The good news is that prediabetes is reversible in most patients with structured lifestyle change, and that early type 2 diabetes is increasingly being placed into remission with weight loss, dietary modification, and the new generation of GLP-1 medications including Mounjaro (tirzepatide) and Wegovy (semaglutide). Identifying raised blood glucose early gives patients access to interventions that work before irreversible damage develops.
The Online GP by The Wellness offers a fast-track, doctor-led screening pathway combining HbA1c, fasting glucose, insulin, lipids, kidney function, urine microalbumin, blood pressure, and clinical examination, all delivered same-day in Marylebone with onward GLP-1 prescribing pathways available where clinically appropriate.
Worried about your blood sugar? Speak to a GMC-registered doctor today: WhatsApp +44 7961 280835
What is HbA1c and why is it the key diabetes test?
HbA1c (glycated haemoglobin, also known as A1c) measures the percentage of haemoglobin in red blood cells that has glucose attached. Because red blood cells circulate for approximately 120 days, HbA1c reflects average blood glucose levels over the previous 8 to 12 weeks. This makes it more reliable than a single point-in-time glucose measurement, which can be affected by recent meals, stress, or illness.
HbA1c is now the preferred screening and diagnostic test for type 2 diabetes in the UK, recommended by NICE, the World Health Organisation, and the British National Formulary. The diagnostic thresholds in mmol/mol are:
HbA1c resultInterpretationBelow 42 mmol/mol (below 6.0%)Normal42 to 47 mmol/mol (6.0% to 6.4%)Prediabetes (high risk of progression)48 mmol/mol or above (6.5% or above)Diabetes (confirmed on repeat testing)53 mmol/mol or above in known diabetesSuboptimal control
HbA1c does not require fasting, can be taken at any time of day, and is highly reproducible between laboratories. There are some clinical scenarios where HbA1c is less reliable: haemoglobinopathies (sickle cell trait, thalassaemia), pregnancy, recent significant blood loss or transfusion, severe iron deficiency, chronic kidney disease, and some medications. In these scenarios, fasting glucose and oral glucose tolerance test (OGTT) provide more accurate diagnosis.
The Online GP by The Wellness uses HbA1c as the first-line screening test for almost all patients, with reflex secondary testing where clinical context warrants.
Who should consider diabetes screening
Diabetes screening is recommended by NICE, Diabetes UK, and the American Diabetes Association for adults with one or more risk factors. The most important risk factors are:
Age over 40 (over 25 in South Asian, Chinese, African, or Caribbean ethnic groups)
Body mass index over 25 (over 23 in higher-risk ethnic groups)
Central obesity (waist circumference over 94cm in men, over 80cm in women)
First-degree family history of diabetes
Personal history of gestational diabetes or large baby (over 4kg birth weight)
Polycystic ovary syndrome (PCOS), with substantial increased prediabetes risk
Cardiovascular disease, hypertension, or dyslipidaemia
History of vascular event (heart attack, stroke, TIA)
High triglycerides or low HDL cholesterol
Acanthosis nigricans (darkened skin patches typically on neck, armpits) suggesting insulin resistance
Long-term use of diabetogenic medications including corticosteroids, certain antipsychotics, some HIV antivirals
Sleep apnoea, particularly when severe or untreated
Non-alcoholic fatty liver disease (NAFLD/MASLD) identified on ultrasound or blood tests
Symptoms suggestive of diabetes including increased thirst, frequent urination, fatigue, recurrent thrush, slow wound healing
The American Diabetes Association recommends screening for prediabetes and type 2 diabetes for all adults aged 35 and over, with earlier screening for adults with risk factors. NICE guidance is similar, recommending opportunistic screening in primary care for at-risk adults.
If you fit any of these categories, a baseline HbA1c is one of the highest-value preventive blood tests available. For patients with multiple risk factors or a positive family history, a comprehensive metabolic panel is more clinically informative than HbA1c alone.
Not sure if you should be screened? Get a quick clinical opinion: WhatsApp +44 7961 280835 | Email team@thewellnesslondon.com
What does the Comprehensive Diabetes & Metabolic Package include?
The Comprehensive Diabetes & Metabolic Health Package at The Online GP by The Wellness costs £395 and includes everything required for a complete metabolic baseline assessment in a single visit, modelled on the assessment a diabetes specialist nurse or endocrinologist would perform in clinic.
The £395 package includes:
A 30-minute GP consultation with a GMC-registered doctor, including focused medical history, family history, dietary assessment, and physical activity review
Body composition assessment: weight, height, BMI, waist circumference, body fat percentage where indicated
Clinical vital signs: blood pressure (with repeat measurement protocol), pulse, oxygen saturation
Comprehensive metabolic blood panel (full breakdown below) processed at our partner laboratory The Doctors Laboratory (TDL) with results returned in 24 to 48 hours
Urine albumin-creatinine ratio (ACR) to screen for early diabetic kidney disease
Clinical foot examination including peripheral pulses and 10g monofilament sensation testing where indicated
Cardiovascular risk assessment using QRISK3 or similar validated tool
Lifestyle assessment including alcohol screen (AUDIT-C), smoking, sleep, and stress
Personalised written action plan with results, interpretation, and clear next steps
Follow-up consultation by phone or video to discuss results
The £595 Comprehensive Plus package adds a structured 12-week reassessment with repeat HbA1c, weight, and waist circumference, plus a personalised lifestyle prescription with optional referral to nutrition or behavioural support.
What does the comprehensive metabolic blood panel test?
The comprehensive diabetes panel at The Online GP by The Wellness measures 22 distinct biomarkers across five clinical domains, providing a much fuller picture than a standalone HbA1c. This is significantly broader than the basic diabetes screen offered by most GPs.
Glucose metabolism:
HbA1c (glycated haemoglobin): the primary marker of glycaemic control over 8 to 12 weeks
Fasting glucose: a single point-in-time blood sugar measurement (requires fasting)
Fasting insulin: identifies insulin resistance even when glucose remains normal
HOMA-IR: a calculated index of insulin resistance combining fasting glucose and insulin
C-peptide (where indicated): distinguishes type 1 from type 2 diabetes by measuring endogenous insulin production
Lipids and cardiovascular risk:
Total cholesterol
LDL cholesterol (the "bad" cholesterol most strongly linked to atherosclerotic risk)
HDL cholesterol (the "good" cholesterol; low HDL is a metabolic syndrome marker)
Triglycerides (often elevated in insulin resistance)
Non-HDL cholesterol and total cholesterol/HDL ratio (key cardiovascular risk markers)
Kidney function:
Urea
Creatinine
Estimated glomerular filtration rate (eGFR)
Urine albumin-creatinine ratio (ACR), the most sensitive early marker of diabetic kidney disease
Liver function:
ALT, AST, GGT, alkaline phosphatase, bilirubin, albumin (NAFLD/MASLD is closely linked to insulin resistance)
Thyroid and adrenal:
TSH (thyroid stimulating hormone) where clinically indicated
Cortisol where Cushing's syndrome is suspected
Vitamin B12 (long-term metformin reduces B12)
Vitamin D (deficiency is associated with insulin resistance)
This breadth means the panel detects not just diabetes but the whole cluster of metabolic syndrome features (insulin resistance, dyslipidaemia, hypertension, fatty liver) that drive cardiovascular risk and shape treatment decisions.
Want to discuss which tests are right for your situation? Speak to a GP today: WhatsApp +44 7961 280835
What does the NICE 2026 updated guidance say?
The National Institute for Health and Care Excellence (NICE) updated its guidance on type 2 diabetes management in February 2026, refining recommendations on first-line and second-line medications, the role of GLP-1 receptor agonists, and individualised HbA1c targets. The Online GP by The Wellness clinical pathway aligns directly with this guidance.
Key elements of the NICE 2026 update include:
Individualised HbA1c targets of 48 mmol/mol for most adults on lifestyle alone or metformin, and 53 mmol/mol for those on medications associated with hypoglycaemia
Earlier consideration of GLP-1 receptor agonists including semaglutide and tirzepatide for adults with type 2 diabetes and obesity, particularly when cardiovascular risk is elevated
SGLT2 inhibitors (dapagliflozin, empagliflozin) as first-line add-on therapy for adults with type 2 diabetes and established cardiovascular disease, heart failure, or chronic kidney disease
Structured education programmes at diagnosis and at intervals thereafter
Annual review including HbA1c, urine ACR, eGFR, blood pressure, weight, foot check, and retinopathy screening
Remission as a treatment goal in selected adults with type 2 diabetes through structured weight loss programmes (Direct trial, NHS Type 2 Diabetes Path to Remission)
For prediabetes, NICE recommends structured lifestyle intervention (5 to 10% weight loss, 150 minutes weekly physical activity, dietary modification) with reassessment at 3 to 12 months. The NHS Diabetes Prevention Programme has shown that around 30 to 40% of participants achieve normoglycaemia at 12 months. Pharmacotherapy (metformin) is recommended for higher-risk prediabetes patients in selected circumstances.
The Wellness pathway delivers each of these elements through fast-track private access, with GLP-1 prescribing available through our existing Mounjaro and weight loss medication pathway, and onward referral to consultant diabetology where complex care is required.
How does The Wellness compare with other London diabetes screening options?
London offers several pathways for self-pay diabetes screening. The table below summarises the main options for patients in 2026, based on publicly available pricing.
The Online GP by The Wellness occupies the doctor-led, integrated, mid-premium position. The £395 comprehensive package is meaningfully more thorough than self-service blood test providers (which deliver numbers without integrated clinical interpretation) but materially less expensive than full Bupa or HCA executive health screening (which often costs £900 to £2,500+ but covers a much broader brief than diabetes specifically).
Our differentiation:
Doctor-led: a GMC-registered GP performs the consultation, interprets results, and prescribes treatment where indicated, in a single same-day pathway
Integrated with broader care: blood tests, ultrasound (e.g. fatty liver scan), GLP-1 prescribing for weight loss (Mounjaro), executive health, hormone optimisation, all in one provider
Multilingual: doctors speaking English, Arabic, Spanish, French, and Dutch
Marylebone medical clinic at 10 Portman Square, walking distance from major Central London transport
NICE-aligned: the pathway directly mirrors the 2026 NICE guidance on diabetes assessment
What happens if results are abnormal?
If screening identifies abnormalities, The Online GP by The Wellness coordinates next steps in real time. The exact pathway depends on what is found.
Prediabetes (HbA1c 42 to 47 mmol/mol):
Detailed lifestyle prescription: 5 to 10% weight loss target, dietary plan (Mediterranean pattern, lower-carbohydrate options where appropriate), 150 minutes weekly aerobic activity plus resistance training, alcohol reduction
Blood pressure and lipid optimisation
Vitamin D and B12 status review
Repeat HbA1c at 3 to 6 months
For higher-risk prediabetes (HbA1c 46 to 47, multiple risk factors, or central obesity), consideration of GLP-1 medication or metformin in selected patients
Newly diagnosed type 2 diabetes (HbA1c 48 mmol/mol or above):
Confirmatory repeat HbA1c (or fasting glucose)
Cardiovascular risk assessment
First-line treatment usually metformin (NICE recommended), with rapid escalation pathway to SGLT2 inhibitors and GLP-1 receptor agonists per NICE 2026
Weight management plan, with consideration of structured remission programme for selected patients
Retinopathy screening referral
Annual review pathway initiated
Suspected type 1 diabetes:
Urgent confirmatory testing (anti-GAD antibodies, C-peptide, ketones)
Same-day referral to consultant diabetology and acute services where indicated
Insulin initiation, which requires specialist hospital pathway, not primary care
Insulin resistance with normal HbA1c:
Common picture in PCOS, NAFLD, central obesity. Lifestyle intervention is the foundation, with metformin in selected patients.
Abnormal kidney or liver markers:
Urine ACR repeat, kidney ultrasound or referral if persistently raised
Liver ultrasound and comprehensive liver panel if LFTs elevated (see our Liver Health Screening guide)
Newly identified hypertension or dyslipidaemia:
Repeat measurement protocol per NICE
Lifestyle and pharmacotherapy as appropriate
Ongoing review
The Wellness team remains the single point of clinical contact through this pathway, with the option to refer back into NHS care or to specialist private hepatology, cardiology, or diabetology when needed.
Just had abnormal results elsewhere? We can help you make sense of them: WhatsApp +44 7961 280835 | Email team@thewellnesslondon.com
Can prediabetes and type 2 diabetes be reversed?
Yes, in many patients. This is one of the most important developments in modern diabetes medicine over the past decade.
Prediabetes reversal is achievable in 30 to 40% of patients through structured lifestyle intervention. The NHS Diabetes Prevention Programme delivers this through dietary change, physical activity, and behavioural support. Outside structured programmes, most evidence supports a 5 to 10% weight loss combined with 150 minutes weekly aerobic activity, dietary modification (Mediterranean or lower-carbohydrate patterns), and alcohol reduction.
Type 2 diabetes remission is increasingly recognised as achievable in selected patients. The Diabetes Remission Clinical Trial (DiRECT), published in The Lancet, showed that around 46% of participants achieved remission at 12 months following a structured 800-calorie liquid diet programme, with the highest rates in those with shorter diabetes duration. The NHS Type 2 Diabetes Path to Remission programme delivers this approach in eligible patients.
The role of GLP-1 medications has transformed weight-related diabetes management. Tirzepatide (Mounjaro) and semaglutide (Wegovy and Ozempic) deliver substantial weight loss (typically 15 to 25% body weight at one year) and improvement in insulin sensitivity, with many patients achieving glucose normalisation while on treatment. The Online GP by The Wellness offers Mounjaro and weight loss medication through a separate doctor-led pathway, with comprehensive baseline blood testing included. See our Mounjaro London 2026 guide for details.
Bariatric surgery remains the most effective single intervention for type 2 diabetes remission in patients with severe obesity, achieving 60 to 80% remission rates in the medium term. The Wellness can refer for bariatric surgery assessment where indicated.
The key clinical message: type 2 diabetes is no longer a one-way street. With the right combination of lifestyle, medication, and (in some cases) surgical intervention, many patients achieve remission. Early identification through screening makes this possible.
What lifestyle changes prevent or reverse diabetes?
The evidence base for lifestyle modification in prediabetes and early type 2 diabetes is one of the strongest in clinical medicine. The Online GP by The Wellness builds personalised plans around the following pillars.
Weight loss is the single most powerful intervention. Each 1% reduction in body weight reduces HbA1c by approximately 0.1%. A 5 to 10% reduction reduces diabetes incidence by 50 to 60% in prediabetes. A 15 to 20% reduction enables remission in many patients. The mechanism is improvement in insulin sensitivity, hepatic insulin signalling, and pancreatic beta-cell function.
Dietary pattern matters more than any single nutrient. The Mediterranean dietary pattern has the strongest evidence in prediabetes prevention (PREDIMED trial). Lower-carbohydrate patterns (40 to 100g carbohydrate per day) reduce HbA1c more rapidly in shorter trials and may suit insulin-resistant patients better. Calorie reduction works through any healthy pattern. Specific harmful elements include sugar-sweetened drinks, ultra-processed foods, and refined carbohydrates eaten without fibre.
Physical activity contributes independently of weight change. 150 minutes per week of moderate aerobic activity reduces diabetes incidence by 30 to 40% in prediabetes. Resistance training (2 sessions per week) improves muscle insulin sensitivity. High-intensity interval training and walking after meals both have evidence in glucose control.
Sleep quality matters. Sleep restriction below 6 hours per night for one week impairs insulin sensitivity by 20 to 30% in healthy adults. Sleep apnoea is closely linked to insulin resistance and warrants screening in patients with daytime sleepiness, snoring, or witnessed apnoeas.
Stress and mental health affect glucose. Chronic stress raises cortisol, which increases hepatic glucose output. Depression doubles diabetes risk, and depression in known diabetes worsens control. The Wellness integrates mental health support into diabetes care where relevant.
Alcohol intake affects glucose and weight. UK guidance (no more than 14 units per week) applies, with consideration of alcohol-free days and meal-time consumption.
Smoking cessation is a primary intervention. Smoking is an independent diabetes risk factor and a major cardiovascular risk amplifier in diabetes.
Coffee has a paradoxical protective effect at 3 to 4 cups daily.
The Online GP by The Wellness delivers all this through a personalised written plan, not generic advice. The £595 Comprehensive Plus package adds 12-week structured reassessment.
Frequently asked questions
Do I need to fast for the diabetes test?
For HbA1c alone, no fasting is required. For fasting glucose, fasting insulin, HOMA-IR calculation, or a fasting lipid panel, you should fast for 8 to 12 hours (water permitted). The full Comprehensive Diabetes & Metabolic Package is best done fasting; we can advise on timing when you book.
How quickly will I get my results?
Same-day clinical assessment, blood pressure, weight, and urine results are available immediately at your appointment. Comprehensive blood test results are typically returned within 24 to 48 hours from The Doctors Laboratory. A full integrated written report is provided within 3 working days, with a follow-up consultation included in the package.
Can a normal HbA1c miss diabetes?
Rarely. HbA1c is highly specific for sustained hyperglycaemia. However, certain conditions affect HbA1c reliability: haemoglobinopathies (sickle cell trait, thalassaemia), recent blood loss or transfusion, significant anaemia, chronic kidney disease, and pregnancy. In these scenarios we use fasting glucose or oral glucose tolerance test (OGTT) instead. Type 1 diabetes typically presents with rapid symptoms and HbA1c may not yet be markedly raised early in onset.
Will my insurance cover the screening?
Most major UK private medical insurers (Bupa, AXA, Vitality, WPA, Aviva) cover diabetes investigation when there is a clinical indication such as raised glucose or symptoms, but coverage rules vary. Pure preventive screening for asymptomatic patients is usually self-pay. We provide detailed receipts for insurance reimbursement.
Do I need a GP referral?
No. The Online GP by The Wellness is a private clinic and you can book directly. We provide a written report you can share with your NHS GP or NHS diabetes specialist nurse if you wish.
Can I have the screening if I am pregnant?
We can perform diabetes screening in pregnancy, but pregnancy-specific gestational diabetes screening typically uses an oral glucose tolerance test (OGTT) at 24 to 28 weeks under NHS pathway. Pre-pregnancy or early-pregnancy HbA1c is informative for women with risk factors. Please mention pregnancy when booking.
How is diabetes screening different from a basic blood test?
A basic blood test typically measures a single parameter such as HbA1c. Diabetes screening at The Online GP by The Wellness combines HbA1c with fasting glucose, fasting insulin, lipids, kidney and liver function, urine ACR, blood pressure, weight, waist circumference, foot check, and clinical history, integrated into a single doctor-led pathway with personalised interpretation.
Will I need treatment if I have prediabetes?
Treatment for prediabetes is primarily lifestyle. Medication (metformin or, increasingly, GLP-1 receptor agonists) is considered in selected patients with multiple risk factors, BMI over 30, or rapidly rising HbA1c. The Online GP by The Wellness will discuss the evidence and what is right for your situation.
Why The Online GP by The Wellness for diabetes screening?
The Online GP by The Wellness brings together the elements that matter for accurate, fast, dignified metabolic health assessment: GMC-registered doctors, comprehensive blood testing through The Doctors Laboratory, CQC registration, integrated same-day pathways, and onward GLP-1 prescribing and consultant diabetology referral relationships.
What sets the clinic apart in 2026:
Doctor-led pathway with clinical interpretation, not just blood test numbers
Same-day consultation, vitals, examination, urine testing, and blood draw in one 30 to 60 minute visit
Comprehensive 22-marker panel covering glucose, insulin, lipids, kidney, liver, thyroid, and vitamin status
Marylebone location at 10 Portman Square, walking distance from Baker Street, Bond Street, and Marble Arch
Multilingual care including English, Arabic, Spanish, French, and Dutch
NICE 2026 guidance-aligned clinical pathway
Direct GLP-1 prescribing pathway for tirzepatide (Mounjaro) and semaglutide (Wegovy) where clinically indicated and appropriate
Integration with broader services including liver health screening, executive health, hormone optimisation, and cardiovascular screening
For UK residents wanting fast access without NHS waits; for patients with a positive family history or rising risk; for adults wanting a baseline; and for those who have been told they have prediabetes or borderline blood sugar, the Comprehensive Diabetes & Metabolic Health Package is one of the highest-value preventive checks available in private medicine.
Book your diabetes screening today
Same-week appointments are usually available; same-day slots often available for urgent clinical concerns. Multilingual doctors, transparent pricing, and a written report you can share with any clinician.
WhatsApp: Message +44 7961 280835 for a same-day reply.
Email: team@thewellnesslondon.com
Phone: 020 3951 3429
In-person: The Wellness, 10 Portman Square, Marylebone, London W1H 6AZ. Opening hours: Monday to Friday 8am–8pm, Saturday 9am–5pm.
Related guides at The Wellness
Mounjaro London 2026: Tirzepatide for Weight Loss and Diabetes Comprehensive Guide
Liver Health Screening London 2026: Doctor-Led Liver Ultrasound and Blood Tests
Private Blood Tests London 2026: Lifestyle, Hormones, and Advanced Panels
Executive Health Screening London 2026: Comprehensive Body Scan Packages
Heart Health Screening London 2026: Doctor-Led Cardiac Assessment
References and further reading
National Institute for Health and Care Excellence (NICE) guidance on type 2 diabetes management, updated February 2026
Diabetes UK national diabetes statistics, 2026
NHS England Diabetes Prevention Programme outcomes data
Diabetes Remission Clinical Trial (DiRECT) published in The Lancet
American Diabetes Association Standards of Medical Care in Diabetes
European Association for the Study of Diabetes (EASD) consensus reports
UK Health Security Agency public health data on diabetes prevalence
NHS Type 2 Diabetes Path to Remission programme outcomes
NICE Quality Standard QS6 on diabetes in adult
The Doctors Laboratory clinical reference ranges and methodology
Disclaimer: This article is for educational purposes only and does not constitute medical advice. Diabetes screening and treatment should be individualised based on personal risk factors, symptoms, and clinical context. The Wellness is a private healthcare clinic with GMC-registered doctors. For severe acute symptoms suggestive of diabetic emergency including persistent vomiting, severe abdominal pain, marked breathlessness, fruity-smelling breath, or significant confusion, attend A&E or call 999 rather than booking elective screening.
