For many people with type 1 diabetes, the recommended HbA1c target is below 7% (53 mmol/mol). However, the best target depends on age, overall health, risk of low blood sugar, and the diabetes management tools available. Some people may safely aim for a lower result, while others may need a less strict goal. A healthcare professional can help determine the most appropriate target for each individual.
HbA1c is an important blood test for understanding how well blood sugar has been managed over time. For people with type 1 diabetes, the goal is to keep blood glucose within a healthy range as safely as possible, balancing the benefits of lower glucose levels against the risk of hypoglycemia, or low blood sugar.
What HbA1c target is recommended for type 1 diabetes?
The American Diabetes Association (ADA) Standards of Care in Diabetes—2026 recommend an HbA1c goal below 7% for many nonpregnant adults with diabetes, provided this can be achieved without significant hypoglycemia or an unacceptable effect on health and quality of life.
This target is a treatment goal rather than a definition of normal blood sugar. People with type 1 diabetes already have a diagnosed condition, so their HbA1c results are used to monitor glucose management and guide care rather than to determine whether they have diabetes.
Some individuals may benefit from a target below 6.5% when it can be achieved safely. Others may need a higher target because of recurrent low blood sugar, difficulty recognizing hypoglycemia, other medical conditions, or the burden of treatment. The right goal should be reviewed regularly as circumstances change.
Do HbA1c targets differ for children and adults?
Yes. Although a target below 7% is appropriate for many adults and children with type 1 diabetes, age, developmental needs, and the risk of low blood sugar influence individual goals.
Children and adolescents
According to the ADA's 2026 Standards of Care for Children and Adolescents, an HbA1c below 7% is appropriate for most young people with diabetes. A lower target, such as below 6.5%, may be considered for selected children and adolescents when it can be achieved without significant hypoglycemia, excessive weight gain, negative effects on well-being, or an unreasonable treatment burden.
Some young people may need a less stringent target, particularly if they cannot reliably recognize or communicate symptoms of low blood sugar, have difficulty accessing glucose monitoring technology, or have experienced severe hypoglycemia. Parents, caregivers, and the pediatric diabetes team should work together to establish a realistic and safe goal.
Older adults
Older adults with type 1 diabetes may have different treatment priorities depending on their overall health, ability to manage insulin safely, cognitive and physical function, and risk of hypoglycemia. The ADA's 2026 glycemic goals guidance supports less stringent targets when frailty, significant medical conditions, functional limitations, or treatment-related risks make tighter control less appropriate.
For some older adults, preventing dangerous low blood sugar and maintaining independence may be more important than achieving a particular HbA1c number. Their targets should reflect their individual circumstances rather than age alone.
What does HbA1c measure?
HbA1c, also called glycated hemoglobin, measures the percentage of hemoglobin in red blood cells that has glucose attached to it. Hemoglobin is the protein that carries oxygen through the body. When glucose circulates in the blood, some of it attaches to hemoglobin, and this attachment provides a record of blood sugar exposure over time.
The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) explains that HbA1c reflects average blood glucose over approximately the previous three months. Recent weeks contribute substantially to the result, so changes in glucose management may influence the next test even before the full three-month period has passed.
Unlike a finger-prick glucose reading, which measures blood sugar at a particular moment, HbA1c provides a longer-term view. However, it cannot show exactly when glucose levels were high or low, and it does not reveal how often hypoglycemia occurred.
Does a lower HbA1c always mean better diabetes control?
Not necessarily. A lower HbA1c can reflect lower average blood glucose, which may help reduce the risk of long-term diabetes complications. However, the number does not tell the whole story. Someone may have a relatively low HbA1c while experiencing frequent episodes of hypoglycemia or large swings between high and low glucose levels.
For this reason, diabetes care involves balancing glucose management with safety and quality of life. A treatment plan should aim to reduce prolonged high blood sugar without causing excessive low blood sugar or placing an unreasonable burden on daily life.
People should not change insulin doses or deliberately allow glucose to rise simply to avoid a low HbA1c result. Insulin adjustments should be based on glucose patterns, treatment goals, and guidance from the diabetes care team.
How often should HbA1c be checked in type 1 diabetes?
HbA1c is commonly measured about every three months when a treatment plan is being adjusted or glucose goals are not being met. For people whose diabetes management is stable and who are meeting their goals, testing at least twice a year may be appropriate. The recommended frequency depends on the clinical situation and the guidance of the healthcare professional.
Children and adolescents are commonly assessed every three months because growth, development, daily routines, and changing insulin needs can affect glucose management. The International Society for Pediatric and Adolescent Diabetes (ISPAD) 2024 glycemic targets guideline also emphasizes regular HbA1c assessment and individualized goals for young people living with diabetes.
Regular testing helps the care team identify longer-term changes and decide whether the existing management plan remains appropriate. HbA1c should be interpreted alongside glucose monitoring results and the person's experience of low and high blood sugar.
How do continuous glucose monitoring results complement HbA1c?
Continuous glucose monitoring (CGM) measures glucose in the fluid beneath the skin throughout the day and night. It provides information that a single HbA1c result cannot show, including glucose trends, time spent within the target range, and episodes of low or high glucose.
For many people with diabetes who use CGM, the ADA recommends a time-in-range goal of more than 70% for the commonly used target range of 70–180 mg/dL (3.9–10.0 mmol/L). This is a general treatment goal for many individuals, not a requirement that applies equally to everyone.
Time in range and HbA1c provide complementary information. Two people with similar HbA1c results may have different daily glucose patterns, including different amounts of time spent below or above their target range. Reviewing both measurements can help the healthcare team make more informed decisions.
What can affect the accuracy of an HbA1c result?
HbA1c is useful for monitoring diabetes, but certain conditions can make the result less reliable or cause it to differ from the glucose readings a person records. This is particularly important when the HbA1c result does not match the person's CGM data or other blood glucose measurements.
- Anemia and iron deficiency: Some forms of anemia and changes in iron levels can affect HbA1c results.
- Changes in red blood cells: Recent blood loss, a blood transfusion, or conditions that change red blood cell lifespan may influence the result.
- Hemoglobin variants: Certain inherited forms of hemoglobin can interfere with some HbA1c testing methods.
- Kidney or liver disease: Some conditions affecting these organs can alter the relationship between HbA1c and average glucose.
The NIDDK's guidance on the HbA1c test describes these limitations and explains why healthcare professionals may consider other glucose measurements when interpreting results. If an HbA1c value appears inconsistent with CGM or blood glucose readings, the care team can investigate whether the difference reflects glucose patterns, testing limitations, or another factor.
How can you work toward your personal HbA1c goal?
Managing type 1 diabetes involves coordinating insulin treatment, glucose monitoring, meals, physical activity, and adjustments for changing circumstances. An HbA1c target is most useful when it is part of an individualized plan that considers both glucose levels and the risk of hypoglycemia.
- Follow your prescribed insulin plan. Insulin is essential for managing type 1 diabetes. Discuss recurring high or low glucose patterns with your healthcare professional before changing doses.
- Review glucose trends. Use blood glucose meter or CGM information to identify patterns that may not be apparent from HbA1c alone.
- Discuss meals and activity. Ask your diabetes team how food, exercise, illness, and daily routines may affect your glucose levels and insulin needs.
- Review your target regularly. Your goal may need to change as your health, treatment technology, daily responsibilities, or risk of hypoglycemia changes.
- Consider the full picture. Your care team can assess HbA1c, glucose variability, time in range, hypoglycemia, and your overall well-being when reviewing your progress.
The aim is not simply to achieve the lowest possible HbA1c. It is to maintain glucose levels as safely as possible while supporting long-term health and everyday life.