On This Page – Quick Medical Summary
Start here: why was this A1C ordered?
An A1C in children is not one test with one meaning. It gets ordered for three different reasons, and the answer you need depends entirely on which reason applies to your child.
If your child has symptoms right now — drinking constantly, urinating far more than usual, losing weight, wetting the bed after being dry for months — this article is not what you need today. Contact your child’s clinician and ask for a blood sugar check today. A result that does not look alarming does not settle that question, and section seven explains why.
If your child was screened at a well-child visit because of weight, family history or another risk factor, and you are now holding a number, sections two through four are yours. If you want the basics first, MedlinePlus keeps a plain-language overview of diabetes in children and teens. If your child already has a diagnosis and you are comparing their target to something you read somewhere, go to section five. If a clinician said “we’ll keep an eye on it” and gave you no number at all, sections three and four explain what they are watching for.
The three jobs an A1C does for a child
| The situation | What the test is doing | What it cannot settle | What to ask |
|---|---|---|---|
| A well child being screened | Looking for early type 2 diabetes or a raised risk, in a child who meets specific criteria | Whether your child will go on to develop diabetes | “Does my child meet the screening criteria, and which version are you using?” |
| A child with symptoms now | Very little. A same-day glucose test answers the urgent question | Whether your child is unwell today — it looks backwards over months | “Can my child have a blood sugar checked today?” |
| A child already diagnosed | Tracking average glucose between visits | Which type of diabetes it is, or what today looks like | “What A1C goal are you using for my child, and what is it based on?” |
If your child has symptoms right now
Type 1 diabetes in children is often identified when symptoms appear rather than through routine screening, and those symptoms can arrive over a few weeks. The federal guidance is explicit that doctors often diagnose type 1 in children when symptoms are present, or when a child may be in diabetic ketoacidosis. That is a same-day question, not a wait-and-see one.
ℹ️ Medical Disclaimer: This article is general health education about how a laboratory test is interpreted in children and adolescents. It does not diagnose any condition, does not recommend or adjust any treatment, medication or diet, does not set a target for any individual child, and does not replace an examination. Diagnosis, glycemic goals, medication decisions, nutrition changes and urgent symptoms in a child are all matters for a board-certified pediatrician or pediatric endocrinologist who has examined your child. If your child is unwell now, contact them today.
The thresholds came from adults, not children
The bands your laboratory prints beside a child’s hemoglobin A1C result are the same bands it prints for a forty-year-old. That is deliberate, and the organization that sets them explains why in its own guidance — which is more than almost any page a parent will find on this question.
What the guideline actually says about where the numbers came from
The American Diabetes Association’s Standards of Care in Diabetes—2026 states in section 2 that the epidemiologic studies that formed the basis for recommending A1C to diagnose diabetes included only adult populations. Section 14 goes further: it says validations of these diagnostic criteria are not currently available in the pediatric population, and that while the ADA acknowledges there are limitations in the data supporting A1C for diagnosing type 2 diabetes in children and adolescents, it continues to recommend its use.
Read that carefully, because it is easy to misread. It does not say the test is broken in children. It says the thresholds were established in adults and then applied to children by clinical judgment rather than by pediatric evidence — and the body that made that judgment published the fact.
Why the same numbers are still used
A result is still a real measurement of a real biological process, and it still carries the same built-in imprecision it carries for an adult — which is why a diagnosis is confirmed rather than made on one reading. Our guide to how an A1C result is read and why a single value is a range rather than a point covers that margin in detail, and it applies to a child exactly as it applies to you.
The tests a parent might ask for instead
The obvious next thought is to ask for a different test. Honestly, there isn’t a better one waiting. The 2026 Standards note that fasting glucose alone may overdiagnose diabetes in children and adolescents, and the International Society for Pediatric and Adolescent Diabetes observed in its 2024 consensus guidelines that the oral glucose tolerance test often has poor reproducibility when repeated in the same individual.
⚠️ Clinical Warning: Each of the three tests has a named limitation in children, published by the bodies that recommend them. None of that makes a raised result in your child something to set aside. It makes it something to confirm and discuss, not something to dismiss — and if your child has symptoms, the number in front of you is not the thing that decides what happens next.
The standard bands themselves, and what each one means, are set out in our A1C reference chart and in what the standard A1C bands mean. This page deliberately does not repeat them, because a threshold read without the context above is exactly how a parent talks themselves into a conclusion a clinician has not reached.
When a doctor should test a child at all
The rule for testing a child is not an age. It is a trigger with three parts, and a child has to meet all three before routine screening is indicated.
The trigger is puberty, not a birthday
Under the 2026 Standards of Care, risk-based screening for prediabetes or type 2 diabetes should be considered after the onset of puberty or after 10 years of age, whichever occurs earlier, in children and adolescents who have overweight or obesity and who have one or more additional risk factors. Puberty comes first in that sentence for a reason, and section four explains it.
Weight is one condition, not the whole rule
Overweight and obesity are defined for children as body mass index at or above the 85th and 95th percentiles for age and sex — categories a clinician reads off a growth chart, not something to calculate at home. Adult BMI calculators do not apply to children and will give you the wrong answer, which is why this page does not link one.
The part most commonly dropped is the third condition. A heavy child with no additional risk factor does not automatically meet the criteria, and a child who is not heavy is not automatically outside them — the federal guidance on who should be tested names low birth weight and a parent who had diabetes during that pregnancy among the additional factors.
Where the published versions of this rule differ
Two current, authoritative statements of this rule do not match, and it is worth seeing both. The NIDDK patient page above, last reviewed in July 2022 and referencing the 2022 Standards, states it as testing children and teens between the ages of 10 and 18. The 2026 Standards state it as a trigger — puberty or 10, whichever is earlier — with no upper bound, so a child who enters puberty at eight meets the current criteria and not the older window.
Neither page is wrong. They are dated differently, and a parent who reads only one will not know that. The same divide exists on the adult side of this question, which we cover in when adults are screened for diabetes, and the choice between an A1C and a glucose tolerance test is covered in choosing between an A1C and a glucose tolerance test.
✅ Patient Action: Before your child’s next visit, ask the pediatrician: “Does my child meet the current screening criteria, and which version of the criteria are you using?” If your child is being screened for one risk factor, ask whether the others are worth checking too — cholesterol testing in children often happens at the same visit and follows its own separate rule.
Puberty is why the rule is not an age
The reason the screening trigger turns on puberty rather than a birthday is physiological, and it is the single most useful thing a parent can understand about a borderline result in a growing child.
What puberty does to insulin
🔬 How It Works: Puberty is a state of significant physiologic insulin resistance — the federal reference chapter on diabetes in children and adolescents, published by the NIDDK and posted in December 2025, describes it as on par with the insulin resistance seen during pregnancy. The body compensates by producing more insulin. When that pubertal insulin resistance is layered on top of insulin resistance associated with excess weight, some young people cannot increase insulin production enough, and glucose rises into the ranges used to define prediabetes or type 2 diabetes.
That is why the guideline waits for puberty and does not wait for a particular age. It is also why a number taken during these years can move in ways it would not in a settled adult.
Why a borderline number is hardest here
The same chapter reports that beta-cell function declines more rapidly in young people than in adults with impaired glucose tolerance or recently diagnosed type 2 diabetes. So a borderline result in a teenager is genuinely less predictable than the same result in a forty-year-old — in both directions. It is not a reason for alarm, and it is not a reason to ignore the number either.
What is still genuinely unknown
This is where most pages stop and where the honest answer starts. In October 2024 the National Institutes of Health launched a study specifically to answer this question, recruiting 3,600 participants aged 9 to 14 who have started puberty, have overweight or obesity, and have A1C levels above the normal range but not high enough for a diagnosis of diabetes.
📊 Clinical Data Point: “Most children we currently consider ‘at-risk’ for developing type 2 diabetes will not actually do so, so we need to better understand what factors define who is at risk” — Barbara Linder, MD, PhD, NIDDK program director, in the NIH announcement of the DISCOVERY study, 9 October 2024. The study’s lead, Rose Gubitosi-Klug, MD, PhD, put the gap plainly in the same announcement: children with overweight or obesity are at risk, “but we don’t know how best to identify the children who will progress to type 2 diabetes.”
Both halves of that belong together. The same NIH announcement states that youth-onset type 2 diabetes is more difficult to treat and progresses more aggressively than the adult disease, with insulin-producing capacity declining faster and complications appearing earlier. A borderline number in a child is not a prediction, and it is not nothing.
The target number many pages still print
This section is for parents of a child who already has a diagnosis. If that is not you, skip to the next one — a glycemic goal is not a screening threshold and reading one as the other is a common and avoidable confusion.
What the current Standards of Care set
The 2026 Standards of Care set, for children and adolescents with type 1 diabetes, a goal of an A1C below 7%. For children and adolescents with type 2 diabetes the goal is below 6.5%. Those two figures apply to children; the goals for adults and for older adults are different numbers set on different reasoning, and our guide to what time in range adds to an A1C covers the other measure now used alongside them.
Both figures come with a condition attached in the guideline itself, and the condition is not optional. The Standards state that glycemic goals should be individualized, that lower goals may be reasonable based on a benefit–risk assessment, that goals should be modified in children with frequent low blood sugar or with hypoglycemia unawareness, and that for those at higher risk of low blood sugar, goals should be individualized as clinically appropriate.
⚠️ Clinical Warning: A goal that is right for one child can be unsafe for another. A higher goal remains appropriate for children who cannot yet describe the symptoms of a low, who have hypoglycemia unawareness, or who do not have access to continuous glucose monitoring or regular testing. Nothing on this page is a reason to change your child’s insulin, medication or routine. The only number that governs your child’s care is the one their own diabetes team has set.
Why the goal for type 2 is lower than for type 1
It looks backwards until the reasoning is stated. The Standards explain that the lower goal in children and adolescents with type 2 diabetes is justified by a lower risk of low blood sugar in that group, together with a higher risk of complications. The goal follows the balance of risks for that child, not the severity of the label.
Why an older number is still on so many pages
Published figures for pediatric targets vary, and a number of widely read pages — including some carrying the name of a major health system — still print a target one step above the current one for both types. The pediatric goal for type 1 diabetes was lowered in the 2020 Standards of Care; before that, the recommended figure was higher, and the older figure has stayed in circulation.
There is one more reason a parent can find conflicting numbers, and it is not an error. The higher figure also appears inside the current Standards themselves, in a different section, where it describes the goal a group of young people was historically measured against. That is a description of past measurement, not a current recommendation.
✅ Patient Action: At your child’s next diabetes appointment, ask the pediatric endocrinologist or diabetes educator: “What A1C goal are you using for my child, what is it based on, and what would make you change it?” Write the answer down — it is the only version of this number that applies to your child.
What the A1C cannot tell you about your child
Four questions parents reasonably try to answer with this number cannot be answered by it, and knowing which is which saves a great deal of worry.
It cannot tell you which type
An A1C measures average glucose. It does not identify type 1 diabetes, type 2, or the rarer monogenic forms, and the assumption that a heavy child with a raised result must have type 2 is no longer safe. The federal reference chapter Diabetes in America states that classifying diabetes in young people as type 1 or type 2 is challenging, particularly because overweight — once associated mainly with type 2 — is now common in young people with type 1.
The same chapter notes that C-peptide, one of the tests used to help sort this out, can be low at the diagnosis of type 2 and normal during the early phase of type 1, so it is not always decisive at onset either. What settles the type is a specific set of tests a clinician orders, and we cover the boundary in what an A1C cannot diagnose.
It cannot be read as a verdict on your parenting or your child’s diet
This is the part worth saying plainly. A borderline result in a child is a reason to have a conversation with a clinician. It is not a reason to change what your child eats on your own initiative, and it is not evidence that you did something wrong.
Restricting a growing child’s food without guidance carries its own risks — to growth, and to a child’s relationship with eating. Any change to a child’s diet or activity belongs with the pediatrician or a pediatric dietitian who can weigh it against how that particular child is growing. That is why this article contains no food advice and links no calculator.
It can be thrown off, and a child is a specific case
An A1C can read higher or lower than the underlying glucose for reasons that have nothing to do with diet, including certain inherited hemoglobin variants and conditions affecting red blood cells. If a child’s A1C and their glucose readings disagree, that mismatch is itself information — it is covered in what makes an A1C result accurate and in results that read higher than they should.
🩺 Physician Note: Federal guidance states plainly that blood testing equipment bought over the counter cannot diagnose diabetes. We do not recommend or link any home A1C kit or children’s glucose monitor on this page. Every next step this article points toward — a repeat laboratory A1C, a same-day glucose test, antibody testing, a pediatric referral — requires a clinician’s order and a laboratory. Recommending a product that our own cited sources say cannot answer the question would not be honest, so we have not.
Signs that mean stop reading and call today
If your child has the signs below, the number on your screen is not the thing that decides what happens next. Contact their clinician today and ask for a blood sugar check.
The signs that need a call today
The CDC’s list of diabetes symptoms, displayed as last reviewed in May 2024, names frequent urination, increased thirst and hunger, losing weight without trying, fatigue, feeling irritable or moody, blurry vision, and frequent urinary or yeast infections. For type 1 specifically it adds nausea, vomiting, stomach pains and diabetic ketoacidosis, and notes that symptoms can appear suddenly, in just a few weeks or months, and can be severe.
The CDC also carries one detail that almost no page about A1C testing mentions: in children, unexplained bed-wetting or increased accidents can be a sign of type 1 diabetes.
⚠️ Clinical Warning: Three of the symptoms on that federal list — tiredness, irritability or moodiness, and needing the bathroom more often — are things most parents would reasonably put down to being a teenager. That is exactly why the cluster matters more than any single sign, and why waiting to see is the wrong instinct when several appear together. If your child is also vomiting, breathing heavily or deeply, drowsy or confused, treat that as an emergency and seek urgent care.
Why a normal-looking A1C does not settle this
An A1C reflects an average over roughly the preceding three months. A child whose glucose has risen sharply over a few weeks can be genuinely unwell while that average still looks unremarkable, and the CDC states that people with type 1 diabetes in its early stages do not have any symptoms at all before those symptoms appear.
The federal guidance is direct on this point: doctors often diagnose type 1 diabetes in children when diabetes symptoms are present, or when a child may have diabetic ketoacidosis. The decision to be seen today is made on how your child is, not on a percentage. If a test does come back raised, why a diagnosis needs a second test explains what normally happens next.
✅ Patient Action: Call your child’s pediatrician today and say: “My child has these symptoms — can they have a blood sugar checked today?” Name the symptoms you have actually seen, including bed-wetting and how much they are drinking. If you cannot reach the practice and your child is vomiting, drowsy or breathing heavily, go to urgent or emergency care.
Questions parents ask about A1C in children
1. What is a normal A1C for a child?
The bands a laboratory prints for a child are the same ones it prints for an adult, and this page deliberately does not repeat them, because a threshold read alone is how a parent reaches a conclusion their clinician has not. Our guide to the standard A1C bands sets them out. Your child’s result should be interpreted by their pediatrician.
2. Why are adult thresholds used on a child’s result?
The 2026 Standards of Care state that the studies behind recommending A1C for diagnosis included only adult populations, and that validations are not currently available in the pediatric population. The ADA acknowledges those limitations and continues to recommend the test in children anyway. The thresholds are applied by clinical judgment rather than by pediatric evidence.
3. At what age should a child be screened?
The current rule is not an age. Screening should be considered after the onset of puberty or after 10 years of age, whichever comes first, in a child with overweight or obesity who also has at least one additional risk factor. Federal patient guidance states it as a window of 10 to 18, which reflects an earlier edition of the same standards.
4. Does my child have to be overweight to be tested?
Weight is one of three conditions in the screening rule, not the whole of it. A child with overweight or obesity still needs at least one additional risk factor before routine screening is indicated, and a child who is not heavy can still be tested if there is a clinical reason. Ask your pediatrician which criteria apply to your child.
5. Why does puberty change the answer?
Puberty is a state of significant physiologic insulin resistance, described in the federal reference chapter as comparable to the insulin resistance of pregnancy. When that is added to insulin resistance associated with excess weight, some young people cannot produce enough extra insulin and glucose rises. That is why the guideline waits for puberty rather than for a birthday.
6. What is a good A1C for a child with type 1 diabetes?
The 2026 Standards set a goal below 7% for children and adolescents with type 1 diabetes. The same guideline requires that goal to be individualized, and a higher goal remains appropriate for children who cannot describe symptoms of a low or who have hypoglycemia unawareness. Your child’s diabetes team sets the goal that applies to them.
7. Why do some pages give a higher target for children?
The pediatric goal for type 1 diabetes was lowered in the 2020 Standards of Care, and the earlier figure has stayed in circulation on many parent-facing pages. Published pediatric targets genuinely vary between sources and editions. The figure that matters is the one your child’s diabetes team is using, which is worth asking about directly.
8. Can an A1C tell whether it is type 1 or type 2?
No — an A1C measures average glucose and does not identify the type of diabetes. Classifying diabetes in young people has become harder because overweight is now common in children with type 1 as well as type 2, and antibody testing is what usually settles it. Ask your pediatrician which test would determine the type for your child.
9. Can a normal A1C miss diabetes in a child?
Yes — an A1C reflects roughly three months of average glucose, so a child whose glucose has climbed over a few weeks can be unwell while the average still looks unremarkable, and the CDC notes that early-stage type 1 diabetes produces no symptoms at all. A same-day glucose test, not an A1C, answers the urgent question. Contact your child’s clinician rather than waiting for a result.
10. My child is thirsty and losing weight — should we wait for a test?
No — contact your child’s clinician today and ask for a blood sugar check. Federal guidance states that type 1 diabetes in children is often diagnosed when symptoms are present, or when a child may have diabetic ketoacidosis. If your child is also vomiting, drowsy or breathing heavily, seek urgent or emergency care rather than waiting.
11. Should I change my child’s diet because of this number?
Not on your own. A borderline result is a reason for a conversation with a clinician, not a reason to restrict a growing child’s food, which carries real risks to growth and to their relationship with eating. Any change to a child’s diet or activity should be planned with their pediatrician or a pediatric dietitian who knows how that child is growing.
What to take to your child’s next appointment
The whole of this page reduces to one thing worth asking out loud. Almost every number attached to an A1C in children came from somewhere other than children today — the diagnostic thresholds from adult studies, and the target figure on many parent-facing pages from an earlier edition of the guidelines. Which is why the useful question is not what the number means in general, but which number your child’s clinician is using.
Three questions, short enough to read off a phone in a waiting room:
- Which number are you using for my child, and what is it based on?
- Does my child meet the current screening criteria, and which version are you using?
- What would make you repeat this test, and when?
For the wider picture of how any A1C result is read and why one value is a range rather than a point, our guide to reading an A1C result is the place to start.
About this content
How this article was put together: researched from recognised health sources, drafted with the help of AI tools, and edited by hand, with sources linked throughout.
Sameer Patel is the founder and editor of My Medicine Advisor. He is not a doctor or medical professional — before starting this site he worked in banking,…
Medical disclaimer
The content on MyMedicineAdvisor is provided for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Health information on this website should not be used to diagnose, treat, cure, or prevent any condition without guidance from a qualified healthcare professional. Always seek the advice of your doctor, physician, or another licensed healthcare provider with any questions you may have regarding a medical condition, symptoms, medications, or treatment decisions.
