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HbA1c & diabetes · London

Private HbA1c (diabetes) test in London, the 3-month blood-sugar reference.

A single blood test for average blood sugar over 3 months - the reference test for diagnosing and monitoring diabetes, interpreted alongside your medications and lifestyle.

A stethoscope on a clinical desk

Indicative pricing

What private HbA1c and diabetes testing costs in London.

Indicative ranges across UK private providers and laboratories.

In short

£45–£90, with results back in 24 hours.

Test or panel Indicative range
HbA1c only £45–£90
HbA1c + fasting glucose £70–£140
Diabetes screen (HbA1c + lipids + LFT + U&Es) £180–£360
HbA1c + diabetologist consult £350–£700
Continuous glucose monitor (CGM) trial · 2 weeks £250–£500
Gestational diabetes OGTT £180–£360

Prices vary by laboratory, whether ancillary markers are included, how quickly you need the results, and whether a phlebotomist comes to you.

The problem

A number on a PDF is not a diagnosis.

Plenty of services will run an HbA1c and email you a figure. Whether that figure means something - pre-diabetes, diabetes, a lab quirk, or nothing at all - is the part that matters. That is what a consultant diabetologist is for.

  • Borderline HbA1c?

    It helps to tell a genuine borderline from an anaemia-distorted reading, and decide whether to repeat, add fasting glucose or move to OGTT.

  • New diabetes diagnosis?

    A consultant diabetologist walks you through the result, what medication is likely and what lifestyle changes make the biggest difference.

What it shows

When an HbA1c actually answers the question.

The situations where HbA1c is the reference test - and one where it isn’t, and you need same-day care instead.

  • Diabetes screening (asymptomatic)

    A single HbA1c is the reference screening test for adults with risk factors - family history, BMI, ethnicity or age.

  • Established type 2 diabetes monitoring

    HbA1c every 3–6 months to track control on metformin, GLP-1s, SGLT2s or insulin.

  • Gestational diabetes screen

    HbA1c is used pre-pregnancy and early in pregnancy; an OGTT is used from 24–28 weeks.

  • Type 1 treatment monitoring

    HbA1c alongside CGM data to review insulin dosing, time-in-range and hypoglycaemia risk.

  • Pre-diabetes (42–47 mmol/mol)

    The window where lifestyle change and, sometimes, medication can prevent progression to diabetes.

  • Pregnancy planning

    Optimising HbA1c below 48 mmol/mol before conception reduces risk to mother and baby.

  • Poor lipid control

    Metabolic syndrome overlaps - HbA1c is checked alongside lipids when triglycerides or HDL are off.

  • Red flag: DKA symptoms

    Thirst, weight loss, ketone breath or breathlessness - same-day A&E, not a private appointment.

HbA1c options, from single marker to CGM.

What each option is actually for.

  • HbA1c only

    The single reference marker. No fasting required. Best for screening and routine monitoring.

  • HbA1c + fasting glucose

    Adds a snapshot to the 3-month average - useful when HbA1c is borderline or unreliable.

  • Diabetes screen - full

    HbA1c plus lipids, LFTs and U&Es for a metabolic and organ-function baseline.

  • HbA1c + diabetologist consult

    A consultant-led review of your results, medication and lifestyle - the most useful package for a new diagnosis.

  • CGM 2-week trial

    A small sensor worn on the arm gives 24/7 glucose data - best-in-class for insulin-treated patients.

  • OGTT (75 g)

    The 2-hour oral glucose tolerance test, used in pregnancy and when HbA1c is unreliable.

  • Type 1 comprehensive panel

    HbA1c, C-peptide, GAD and IA-2 antibodies to characterise and confirm type 1 diabetes.

  • Post-bariatric follow-up

    HbA1c with iron, B12 and vitamin D to track remission and screen for deficiencies.

Preparation and practicalities

One of the simplest tests in medicine - with caveats worth knowing.

HbA1c is straightforward, but a handful of things - anaemia, haemoglobin variants, pregnancy - can change how the result should be read.

  • No fasting required

    HbA1c reflects the last 3 months of blood sugar, so it does not matter when you last ate.

  • Anaemia distorts HbA1c

    Iron-deficiency anaemia can push HbA1c falsely low; some anaemias push it falsely high.

  • Haemoglobinopathies also distort HbA1c

    Sickle cell trait, thalassaemia and HbC/HbE variants can affect the assay. Fructosamine or CGM may be used where needed.

  • Pregnancy - HbA1c is less reliable

    Red-cell turnover rises in pregnancy, so HbA1c under-reads. OGTT is the standard from 24–28 weeks.

  • CGM is best-in-class for insulin-treated

    Time-in-range and hypoglycaemia data change management in ways HbA1c alone cannot.

  • Fingerprick BM is different from HbA1c

    Home glucose meters give a snapshot; HbA1c is the 3-month average. Both have a role, and they should agree in spirit.

  • Thresholds

    Under 42 mmol/mol is normal, 42–47 mmol/mol is pre-diabetes, 48 mmol/mol or above is diabetes.

  • A single result deserves a repeat

    A diagnosis of diabetes on HbA1c usually needs a confirmatory repeat unless symptoms are unmistakable.

  • Always share prior results

    Trend matters more than any single number. Bring old HbA1cs and CGM downloads to your review.

Reading your report

An HbA1c report is short. Read the impression first.

However many ancillaries were run, the report follows the same four parts.

A UK consultant diabetologist reviewing an HbA1c result

A quiet reminder

A single HbA1c is a snapshot of an average - context and trend are everything.

Ask your clinician to talk you through it before your follow-up.

  1. 01 Header

    Indication and medications

    Your details, why the test was requested, and the medications and supplements that could affect the result.

  2. 02 Technique

    HbA1c method and ancillaries

    Which laboratory ran the assay, which method (HPLC or immunoassay), and any ancillary tests included.

  3. 03 Findings

    Your value and the trend

    Your HbA1c in mmol/mol and DCCT %, alongside prior results where available, so the trajectory is visible.

  4. 04 Impression

    Read this first - what it means

    Normal, pre-diabetes or diabetes, and the next steps - lifestyle, repeat testing, referral or medication review.

Recognised by major UK insurers

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Frequently asked

Common questions about HbA1c.

Quick answers on what HbA1c measures, fasting, anaemia, pregnancy, CGM, cost and referral.

  • What does HbA1c actually measure?

    HbA1c is the fraction of haemoglobin in your red blood cells that has glucose attached to it. Because red cells live for around 3 months, HbA1c reflects your average blood sugar over the previous 8–12 weeks.

  • Do I need to fast for an HbA1c?

    No. HbA1c is unaffected by when you last ate, so you can have it done at any time of day.

  • Can anaemia affect my HbA1c?

    Yes. Iron-deficiency anaemia often pushes HbA1c falsely low, and some anaemias push it high.

  • Is HbA1c reliable in pregnancy?

    HbA1c is useful pre-pregnancy and in the first trimester, but red-cell turnover rises later in pregnancy and makes it under-read. The oral glucose tolerance test (OGTT) is the standard from 24–28 weeks.

  • What is CGM and do I need it?

    A continuous glucose monitor is a small sensor worn on the arm that records glucose 24/7 for 10–14 days. It is best-in-class for anyone on insulin, and revealing for anyone with unexplained highs, lows or borderline HbA1c.

  • How much does a private HbA1c cost?

    A single HbA1c is typically £45–£90, adding fasting glucose brings it to £70–£140, a full diabetes screen is £180–£360, and a consultant-led review with the test is £350–£700.

  • How quickly do I get results?

    A full diabetes screen with lipids and biochemistry takes 3–5 days.

  • Can pre-diabetes be reversed?

    Often, yes. A 5–10% weight loss, regular activity and a Mediterranean-style diet can bring pre-diabetes (42–47 mmol/mol) back into the normal range, and reduce progression to diabetes by more than half.

  • When should I see a GP urgently?

    If you have thirst, rapid weight loss, ketone-smelling breath, breathlessness, or a very high blood glucose reading on a home meter, go to A&E or call 111 the same day - this is not a private-appointment situation.

Related tests

Looking for something else?

In practice, in London

Booking hba1c diabetes privately in London - what actually happens

With hba1c diabetes, the London question is usually about report turnaround and the radiologist reading it - not whether the scan is available. The NHS route for hba1c diabetes is thorough, but the queue is real. Many patients are told to expect anywhere from a handful of weeks to several months, depending on their local trust and how the referral is graded. Going private in London usually collapses that window to a matter of days - often the same week if the diary allows. It isn’t about jumping a queue so much as buying time back while you still have the flexibility to plan around it.

The mechanics are straightforward: a consultant appointment, any tests done at a nearby CQC-registered site, and a written report back within a few days. London’s density of private diagnostics - Marylebone, the City, Chelsea, Canary Wharf - means most patients can find something that fits around work without a cross-town trek. For hba1c diabetes specifically, the difference between a routine report and a sub-speciality read is where private care earns its keep.

There are dozens of consultants in London who see hba1c diabetes - but not all of them are the right fit for every case. The right first appointment saves you from repeating yourself later.