HbA1c target for type 1 diabetes is a central pillar of long-term diabetes management in the UK. Glycated haemoglobin (HbA1c) reflects average blood glucose levels over the preceding two to three months, making it one of the most important tools for assessing diabetes control. For people living with type 1 diabetes, achieving an appropriate HbA1c target can significantly reduce the risk of serious complications, including retinopathy, nephropathy, neuropathy, and cardiovascular disease. This article explains the NICE-recommended targets for adults and children, the factors that influence individual goals, and how to work safely towards better glucose control.
Summary: The recommended HbA1c target for type 1 diabetes in the UK is 48 mmol/mol (6.5%) or below, if achievable safely without problematic hypoglycaemia, as per NICE guideline NG17.
- NICE NG17 recommends an HbA1c target of 48 mmol/mol (6.5%) or below for adults with type 1 diabetes, provided this can be achieved without problematic hypoglycaemia.
- The same 48 mmol/mol target applies to children and young people with type 1 diabetes under NICE NG18, though achieving it can be more challenging in younger age groups.
- Pursuing an excessively low HbA1c increases the risk of hypoglycaemia, which can cause loss of consciousness, seizures, and life-threatening events.
- HbA1c results can be unreliable in people with anaemia, haemoglobinopathies, recent blood transfusion, chronic kidney disease, or during pregnancy.
- NICE recommends offering real-time or intermittent-scanning CGM to all people with type 1 diabetes, and time in range (TIR) is now used alongside HbA1c to assess glucose control.
- HbA1c should be measured every three to six months in adults with type 1 diabetes, and more frequently if control is suboptimal or treatment has recently changed.
Table of Contents
- What Is the Recommended HbA1c Target for Type 1 Diabetes in the UK?
- NICE Guidelines on HbA1c Goals for Adults and Children
- Factors That May Affect Your Individual HbA1c Target
- How to Work Towards Your HbA1c Target Safely
- When HbA1c Targets May Need to Be Adjusted
- Monitoring HbA1c and Reviewing Your Diabetes Care Plan
- Frequently Asked Questions
What Is the Recommended HbA1c Target for Type 1 Diabetes in the UK?
NICE NG17 recommends an HbA1c target of 48 mmol/mol (6.5%) or below for adults with type 1 diabetes, if achievable safely without problematic hypoglycaemia. HbA1c is increasingly used alongside CGM metrics such as time in range for a fuller picture of glucose control.
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HbA1c — or glycated haemoglobin — is a blood test that reflects your average blood glucose levels over the preceding two to three months. It is one of the most important measures used to assess long-term diabetes management. For people living with type 1 diabetes in the UK, achieving an appropriate HbA1c target is central to reducing the risk of serious complications, including damage to the eyes (retinopathy), kidneys (nephropathy), nerves (neuropathy), and cardiovascular disease.
According to NICE guidance (NG17), the standard recommended HbA1c target for adults with type 1 diabetes in the UK is 48 mmol/mol (6.5%) or below, if this can be achieved safely without problematic hypoglycaemia. This level is associated with a meaningful reduction in the risk of long-term complications. However, it is important to understand that this is a general benchmark — not a universal rule — and individual circumstances will always influence what is considered appropriate for each person.
It is equally important to recognise that lower is not always better. Pursuing an excessively low HbA1c can increase the risk of hypoglycaemia (low blood sugar), which carries its own serious risks, including loss of consciousness, seizures, and in rare cases, life-threatening events. The goal is therefore to achieve the best possible glucose control whilst minimising hypoglycaemia risk — a balance that requires ongoing discussion with your diabetes care team.
It is also worth noting that HbA1c alone does not capture the full picture of glucose management. It does not reflect glycaemic variability, the frequency of hypoglycaemic episodes, or time spent with very high glucose levels. For this reason, HbA1c is increasingly used alongside continuous glucose monitoring (CGM) metrics — such as time in range (TIR) — to give a more complete assessment of glucose control.
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NICE Guidelines on HbA1c Goals for Adults and Children
NICE recommends an HbA1c target of 48 mmol/mol (6.5%) for both adults (NG17) and children and young people (NG18) with type 1 diabetes. NICE also recommends offering CGM to all people with type 1 diabetes to help achieve targets whilst reducing hypoglycaemia.
NICE guidance provides clear recommendations on HbA1c targets for people with type 1 diabetes across different age groups. For adults with type 1 diabetes (NICE NG17), the recommended target is 48 mmol/mol (6.5%) if this can be achieved safely without problematic hypoglycaemia. Where this target cannot be safely reached, a personalised goal should be agreed between the individual and their clinical team.
For children and young people with type 1 diabetes (NICE NG18), the same HbA1c target of 48 mmol/mol (6.5%) is recommended, whilst acknowledging that achieving this in younger age groups can be particularly challenging due to factors such as growth, hormonal changes, and the unpredictability of activity and appetite. NICE emphasises that targets should be set collaboratively, taking into account the child's developmental stage and the family's capacity to manage the condition.
NICE also provides clear guidance on the role of technology in supporting HbA1c targets:
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Continuous glucose monitoring (CGM): NICE recommends offering real-time CGM or intermittent-scanning CGM (flash glucose monitoring) to all adults, children, and young people with type 1 diabetes. Evidence shows that CGM can help improve HbA1c levels whilst reducing hypoglycaemia.
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Insulin pump therapy (CSII): Continuous subcutaneous insulin infusion is recommended for specific indications, such as disabling hypoglycaemia or suboptimal glucose control despite optimised multiple daily injection (MDI) therapy. It is not routinely offered to everyone with type 1 diabetes. If you think you may benefit from a pump, discuss this with your diabetes specialist team.
NHS England has expanded access to CGM technology, and eligible individuals should speak with their diabetes team about what is available to them.
Alongside HbA1c, NICE now recommends using time in range (TIR) — the proportion of time glucose levels remain within a target range — as a complementary measure of glucose management, particularly for those using CGM.
Factors That May Affect Your Individual HbA1c Target
Individual factors such as impaired hypoglycaemia awareness, pregnancy, frailty, comorbidities, and conditions affecting HbA1c reliability can all influence the most appropriate personalised target. Your diabetes care team will consider these when agreeing your goal.
Whilst the standard target of 48 mmol/mol provides a useful benchmark, several individual factors can influence what HbA1c goal is most appropriate for you. Your diabetes care team will consider these carefully when agreeing a personalised target.
Key factors include:
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Hypoglycaemia awareness: People who experience impaired awareness of hypoglycaemia (IAH) — meaning they do not reliably detect the warning signs of low blood sugar — may need a higher HbA1c target to reduce the risk of severe episodes.
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Duration of diabetes: Those who have lived with type 1 diabetes for many years may have different physiological responses to glucose fluctuations, which can affect target-setting.
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Pregnancy or planning a pregnancy: Women with type 1 diabetes who are planning to conceive are advised to aim for an HbA1c of 48 mmol/mol (6.5%) or below before conception, if this can be achieved safely. If HbA1c is above 86 mmol/mol (10%), specialist preconception advice should be sought and conception is generally not recommended until control improves. During pregnancy, NICE (NG3) recommends aiming to keep HbA1c below 48 mmol/mol (6.5%) if achievable without problematic hypoglycaemia, alongside specific capillary blood glucose targets (fasting ≤5.3 mmol/L; one hour after meals ≤7.8 mmol/L; two hours after meals ≤6.4 mmol/L). HbA1c is typically monitored monthly during pregnancy. Close specialist monitoring throughout pregnancy is essential.
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Comorbidities: The presence of other health conditions, such as cardiovascular disease, renal impairment, or mental health difficulties, may influence how aggressively glucose targets are pursued.
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Age and frailty: In older adults or those with frailty, a less stringent target may be appropriate to avoid hypoglycaemia and maintain quality of life.
Limitations of HbA1c: It is important to be aware that HbA1c results can be unreliable in certain situations, including iron-deficiency anaemia, haemolytic anaemia, haemoglobinopathies (such as sickle cell disease or thalassaemia), recent blood transfusion, and during pregnancy. In these circumstances, your diabetes team may rely more heavily on CGM data or capillary blood glucose profiles to assess your glucose control.
It is also worth noting that emotional wellbeing and diabetes distress are increasingly recognised as important factors. If managing towards a specific HbA1c target is causing significant anxiety or burnout, this should be discussed openly with your care team.
How to Work Towards Your HbA1c Target Safely
Structured education programmes such as DAFNE, insulin regimen optimisation, CGM use, and consistent carbohydrate awareness are evidence-based approaches to improving HbA1c safely. Always make insulin regimen changes in consultation with your diabetes care team.
Working towards your HbA1c target requires a structured, supported approach that balances effective glucose management with everyday safety. There is no single strategy that works for everyone, but several evidence-based approaches can help.
Structured education is a cornerstone of type 1 diabetes management. Programmes such as DAFNE (Dose Adjustment For Normal Eating) teach people how to adjust their insulin doses in response to carbohydrate intake, physical activity, and illness. Completing a structured education programme has been shown to improve HbA1c and reduce hypoglycaemia rates, and is recommended by NICE (NG17).
Insulin regimen optimisation is also essential. Most adults with type 1 diabetes use a basal-bolus regimen, combining a long-acting background insulin with rapid-acting insulin at mealtimes. Working with your diabetes team to fine-tune your insulin-to-carbohydrate ratios, correction factors, and basal doses can make a significant difference to your HbA1c.
Additionally, consider the following practical steps:
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Regular self-monitoring of blood glucose (SMBG) or use of a continuous glucose monitor (CGM) to identify patterns and inform dose adjustments.
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Consistent carbohydrate awareness — not necessarily a low-carbohydrate diet, but an understanding of how different foods affect your glucose levels.
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Physical activity planning — exercise affects glucose in complex ways in type 1 diabetes, and your team can advise on adjusting insulin and carbohydrate intake around activity.
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Sick day rules — knowing how to manage your insulin during illness is essential. Key points include: never omit your basal (background) insulin even if you are not eating; check blood ketones if your glucose is persistently above 13 mmol/L or if you feel unwell; increase fluid intake; and follow your local ketone correction protocol. Seek urgent medical advice the same day if you are vomiting, unable to keep fluids down, feel drowsy or confused, or if blood ketones remain at 1.5 mmol/L or above — these may be signs of diabetic ketoacidosis (DKA). Call 999 if you or someone else is unconscious or having a seizure.
Always make changes to your insulin regimen in consultation with your diabetes care team rather than independently.
| Patient Group | Recommended HbA1c Target | NICE Guidance | Key Considerations | Monitoring Frequency |
|---|---|---|---|---|
| Adults with type 1 diabetes | 48 mmol/mol (6.5%) or below | NICE NG17 | Only if achievable without problematic hypoglycaemia; personalise if not | Every 3–6 months; every 3 months if suboptimal control |
| Children and young people with type 1 diabetes | 48 mmol/mol (6.5%) or below | NICE NG18 | Challenging due to growth, hormones, activity; set targets collaboratively with family | At least every 3–6 months |
| Planning pregnancy (preconception) | 48 mmol/mol (6.5%) or below | NICE NG3 | Conception not recommended if HbA1c above 86 mmol/mol (10%); seek specialist advice | Monthly during pregnancy |
| During pregnancy | Below 48 mmol/mol (6.5%) | NICE NG3 | Alongside capillary glucose targets; fasting ≤5.3 mmol/L, 1 hr post-meal ≤7.8 mmol/L | Monthly |
| Impaired hypoglycaemia awareness (IAH) | Higher, personalised target | NICE NG17 | Relaxed target reduces severe hypoglycaemia risk; review via DAFNE or specialist service | Every 3 months until stabilised |
| Older adults or those with frailty | Less stringent, individualised | NICE NG17 | Avoid hypoglycaemia; prioritise quality of life over tight glycaemic control | Every 3–6 months |
| Conditions affecting HbA1c reliability (e.g. anaemia, haemoglobinopathy, CKD) | HbA1c unreliable; use CGM or capillary glucose profiles | NICE NG17 | Includes sickle cell disease, thalassaemia, haemolytic anaemia, recent transfusion | Consult SmPC / diabetes team |
When HbA1c Targets May Need to Be Adjusted
HbA1c targets should be reviewed if you experience recurrent severe hypoglycaemia, significant life changes, pregnancy, new complications, or conditions that affect HbA1c reliability. Seek same-day urgent advice for severe hypoglycaemia or persistent high glucose with ketones at 1.5 mmol/L or above.
HbA1c targets are not fixed for life. There are several clinical situations in which your target may need to be reviewed and revised, either upwards or downwards, to reflect your changing circumstances.
Situations that may prompt a target adjustment include:
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Recurrent or severe hypoglycaemia: If you are experiencing frequent low blood sugar episodes, particularly those requiring assistance from another person, your target may need to be relaxed temporarily whilst hypoglycaemia awareness is addressed — for example, through a structured programme such as DAFNE or referral to a specialist hypoglycaemia service. Seek same-day urgent advice if you have had a severe hypoglycaemic episode or are experiencing recurrent episodes that are difficult to manage.
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Significant life changes: Starting a new job, bereavement, relationship changes, or other major stressors can affect diabetes self-management and may temporarily make tight control less achievable.
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Pregnancy: As noted above, targets during pregnancy require close specialist monitoring and are guided by both HbA1c and capillary glucose targets (NICE NG3).
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New diagnosis of complications: If diabetes-related complications are identified, your team may reassess whether your current target remains appropriate or whether more intensive management is warranted.
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Conditions affecting HbA1c reliability: HbA1c results can be unreliable in people with chronic kidney disease (due to altered red blood cell turnover), as well as in those with anaemia (iron-deficiency or haemolytic), haemoglobinopathies, recent blood transfusion, or during pregnancy. In such cases, alternative measures of glucose control — such as CGM data or capillary blood glucose profiles — may be used instead.
When to seek urgent help: Contact your diabetes team or GP the same day if you experience recurrent severe hypoglycaemia, persistent high glucose with blood ketones at 1.5 mmol/L or above, vomiting, or any symptoms that may suggest DKA. Call 999 immediately if you or someone else is unconscious, fitting, or seriously unwell.
If you feel your current HbA1c target is no longer realistic or safe, contact your GP or diabetes specialist team to arrange a review. You should not attempt to significantly alter your insulin regimen without professional guidance.
Monitoring HbA1c and Reviewing Your Diabetes Care Plan
NICE recommends HbA1c be measured every three to six months in adults with type 1 diabetes, and at least every three to six months in children. An annual diabetes review should also assess blood pressure, kidney function, retinal screening, foot health, and other cardiovascular risk factors.
Regular monitoring of HbA1c is a fundamental part of type 1 diabetes care in the UK. In line with NICE (NG17), HbA1c should be measured every three to six months in adults with type 1 diabetes, and every three months if glucose control is suboptimal, if the treatment regimen has recently changed, or if there are other clinical concerns. Children and young people with type 1 diabetes should also have HbA1c checked at least every three to six months (NICE NG18).
HbA1c testing is typically carried out at your GP surgery or diabetes clinic, and results are usually available within a few days. It is important to attend these appointments consistently, as HbA1c trends over time are often more informative than a single result. A gradual rise in HbA1c, for example, may indicate that your current regimen needs adjustment, even if the absolute value remains within target.
Your annual diabetes review — which should be offered to all people with type 1 diabetes through the NHS — is an opportunity to assess your HbA1c alongside other important checks as part of the NHS diabetes annual care processes, including:
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Blood pressure and cholesterol (cardiovascular risk)
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Urine albumin-to-creatinine ratio (ACR) and estimated glomerular filtration rate (eGFR) (kidney function)
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Retinal screening (eye health)
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Foot examination
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BMI or weight
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Smoking status
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Review of medications and technology
If you have not received an annual review, or if your HbA1c has risen significantly between appointments, contact your GP or diabetes team promptly.
If you experience any suspected side effects from your diabetes medicines or medical devices (including insulin, CGM sensors, or insulin pumps), you can report these via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk or through the Yellow Card app.
Proactive engagement with your care plan is one of the most effective ways to protect your long-term health. Remember, HbA1c is just one part of the picture — your overall wellbeing, quality of life, and freedom from hypoglycaemia matter equally.
Key references: NICE NG17 (Type 1 diabetes in adults: diagnosis and management); NICE NG18 (Diabetes — type 1 and type 2 in children and young people); NICE NG3 (Diabetes in pregnancy: management from preconception to the postnatal period); NHS diabetes annual care processes.
Frequently Asked Questions
What is the HbA1c target for type 1 diabetes according to NICE?
NICE guideline NG17 recommends an HbA1c target of 48 mmol/mol (6.5%) or below for adults with type 1 diabetes, provided this can be achieved safely without problematic hypoglycaemia. The same target applies to children and young people under NICE NG18.
Can my HbA1c target change if I am pregnant or planning a pregnancy?
Yes. NICE NG3 recommends that women with type 1 diabetes planning to conceive aim for an HbA1c of 48 mmol/mol (6.5%) or below before conception if safely achievable, and that HbA1c is monitored monthly during pregnancy alongside specific capillary blood glucose targets.
How often should HbA1c be checked in type 1 diabetes?
NICE recommends that HbA1c is measured every three to six months in adults and children with type 1 diabetes. More frequent testing — every three months — is advised if glucose control is suboptimal, the treatment regimen has recently changed, or there are other clinical concerns.
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