On This Page – Quick Medical Summary
The short answer, and who it does not fit
Both US bodies that set diabetes screening age guidance now put the start at 35 — not 45. That is the current answer for most adults, and the qualifier matters as much as the number.
The 45 you have almost certainly seen is real, but it is doing a different job. It appears on the CDC’s list of things that raise your risk, and it was the American Diabetes Association’s starting age until 2022.
Four different numbers are published on this question, by four organizations, for four different purposes.
Where you fit
- If you are 35 to 44: the current guidelines say testing should already have started. This is the group most likely to be waiting on a number that no longer applies.
- If you are 45 or older: you are past every published start age. The question worth asking is whether it has actually been done, and how recently.
- If you are under 35: age alone does not trigger screening, but several other things do. Section five covers them.
- If you are here for someone else: a parent, a partner, or a teenager, the rules differ by age group, and the section on children is genuinely different from the adult one.
If you already have a result
If you already have a result in hand rather than a question about eligibility, you want how to read an A1C result or what a normal A1C means instead. This page is about who gets tested, not what the number says.
ℹ️ Medical Disclaimer: This article is general health education about screening eligibility and insurance coverage. It does not diagnose any condition, recommend or adjust any medication, direct any procedure, and it cannot tell you what your own plan will pay. Screening decisions, test selection and coverage questions should be confirmed with a board-certified primary care physician and, for anything involving cost, with your health plan directly.
Four sources, four numbers, four different jobs
The apparent disagreement dissolves once you see what kind of statement each number is. A clinical guideline tells a clinician when to start testing, while a risk factor describes who is more likely to develop a condition. A coverage list does something different again: it decides who gets the test paid for.
A guideline and a risk factor are not the same object
The American Diabetes Association’s Standards of Care in Diabetes — 2026 states in Section 2 that testing should begin no later than age 35 for all people, and its Recommendation 2.12b puts it plainly: for all other people, screening should begin at age 35 years. That is a grade B recommendation to clinicians.
The CDC’s entry is different in kind. On CDC’s list of diabetes risk factors, being age 45 or older sits among seven items — alongside overweight or obesity, having a parent or sibling with type 2 diabetes, and physical inactivity. It describes elevated risk rather than instructing anyone on when to begin testing.
Who each rule leaves out
| Source | The number it names | What kind of statement it is | Who this rule does not cover |
|---|---|---|---|
| ADA Standards of Care 2026 | 35 | A clinical guideline: when a clinician should start | People under 35 without overweight or obesity plus a risk factor |
| US Preventive Services Task Force (2021) | 35 to 70 | An evidence review — and the one insurance coverage follows | Anyone at a healthy weight, at any age; anyone over 70 |
| CDC risk-factor list | 45 or older | A risk factor, one of seven — not a start age | Nobody: it is not an eligibility rule at all |
| HealthCare.gov preventive list | 40 to 70 with overweight or obesity | What the no-cost list currently says | People aged 35 to 39; anyone at a healthy weight |
Sources: ADA Standards of Care in Diabetes — 2026, Section 2; USPSTF final recommendation statement, 24 August 2021; CDC diabetes risk factors; HealthCare.gov preventive care benefits for adults, all checked 6 August 2026. The fourth column is our own framing, not any organization’s.
Where the numbers agree
Read the fourth column carefully, because it contains the trap. Two of these four rules carry a body-weight condition and two do not. The ADA’s age-35 recommendation applies to all people; a healthy weight is not an exemption from it, even though it does place you outside the task force’s criteria.
The CDC’s own research summary puts the convergence in one line: the updated USPSTF and ADA guidelines both recommend some adults be screened starting at age 35, and every three years after. The interval that follows is a separate question, covered in how often the test is repeated.
🩺 Physician Note: A common point of confusion is treating a risk-factor list as a screening schedule. Risk factors tell a clinician how concerned to be; screening recommendations tell them when to start looking. The same person can sit inside one and outside the other, which is exactly what produces the impression that the guidance contradicts itself.
Why 45 turns up everywhere, and what it is
The number 45 is not an error anyone made. It is two accurate things being read as a third thing that no organization currently says.
CDC lists 45 as a risk factor, not a start age
CDC’s prediabetes and type 2 diabetes pages carry the age-45 entry inside a risk-factor list, and its patient-facing testing page names no screening age at all. That page tells readers to ask their doctor about testing if they have any of the risk factors, then links to the list.
So a reader arrives wanting a start age, finds a page that does not give one, and takes the only number visible. That is a reasonable reading of a page that was never written to answer the question.
The ADA did use 45 — until 2022
The association’s earlier position was genuinely 45, and it applied to all adults regardless of risk factors. CDC’s summary of the updated screening guidelines records the change directly: previously the ADA recommended all adults 45 years or older be screened, and in 2022 it lowered the screening age to 35.
Anything published before 2022 that says 45 was correct when it was written. Much of it is still online, undated, which is why the older number remains easy to find.
What the task force changed, and when
The same CDC summary dates the other move. In 2021 the task force expanded its criteria from adults aged 40 to 70 with overweight or obesity to adults aged 35 to 70 with overweight or obesity — its own clinician summary describes it as lowering the starting age from 40 to 35.
There is one more reason 45 feels like a screening age: on some lists, it is one. The federal preventive services list that names 40 for diabetes screening names 45 as the start for colon cancer screening, covering adults 45 to 75. Screening ages are set test by test, and a number that starts one screen has nothing to do with another.
📊 Clinical Data Point: An additional 12 to 14 million US adults became eligible for glucose testing under the updated guidelines, and just over half of US adults reported having had a glucose test in the previous three years — Source: CDC research summary, “Additional 12 Million U.S. Adults Eligible for Diabetes Screening,” page dated 15 May 2024.
✅ Patient Action: At your next appointment, ask your primary care physician: “Given my age and my risk factors, which screening rule are you applying to me — and has a screening test already been done?”
The rule your insurance actually follows
The clinical answer and the billing answer are set by different bodies, and right now they name different ages. Knowing which one your plan is using is what determines whether a screening test arrives free or with a bill attached.
Why coverage follows the task force
Marketplace plans and many others must cover a defined list of preventive services without a copayment or coinsurance, even if you have not met your deductible. That list is built from the task force’s graded recommendations, not from the ADA’s guidelines — which is why the association’s move to 35 did not automatically change what your plan pays for.
What the preventive list says today
Item 8 on the Marketplace preventive services list currently reads: type 2 diabetes screening for adults 40 to 70 years who are overweight or obese. That is the age range from the task force’s 2015 statement, which was replaced in August 2021.
The page also carries its own caution, and it should travel with any coverage claim: coverage may vary, and $0 cost is not guaranteed in every case. A list describing a benefit is not a promise about your specific plan, your network, or how a particular visit gets coded.
What to do if you are 35 to 39
You are in the gap. The clinical recommendation says testing should have started; the no-cost list currently names 40. Neither of those facts stops a clinician from ordering the test, and asking costs nothing.
If a preventive test has already come back with an unexpected charge, that is a separate and solvable problem covered in what to do when preventive blood work produces a bill. It is also worth knowing what a routine annual panel usually includes, since a screening glucose test is often ordered alongside it.
✅ Patient Action: Before the appointment, ask your plan’s member services one question: “Is a screening A1C billed as a preventive service under my plan at my age?” Ask your physician the clinical question separately — the two answers can differ, and you want both.
When testing should start before 35
Age is one input among several, and for a good number of people it is not the one that decides. Both guideline bodies describe circumstances in which testing is appropriate well before any published start age.
What raises risk regardless of age
The ADA recommends screening adults who have overweight or obesity together with one or more additional risk factors, regardless of age. CDC’s summary of the guidelines states the same thing in patient language: all adults with overweight or obesity and at least one risk factor should be screened.
CDC’s risk list names the factors that count. They include a parent or sibling with type 2 diabetes, physical activity fewer than three times a week, non-alcoholic fatty liver disease, and a history of gestational diabetes or of giving birth to a baby over nine pounds.
Two of these have their own pages worth reading if they apply to you: the cluster of findings that often appear together in metabolic syndrome, and polycystic ovary syndrome, which both the ADA and the task force name among the conditions that warrant earlier attention.
Why body weight is on every list
Overweight and obesity are described by the task force as the strongest risk factors for developing prediabetes and type 2 diabetes in adults. That is why a weight condition appears in three of the four rules in the table above.
It is also why the exemption reading is so easy to fall into, and it is wrong. A healthy weight places you outside the task force’s criteria; it does not place you outside the ADA’s age-35 recommendation, which names no weight condition at all.
The task force also advises clinicians to consider screening earlier in people from population groups with higher prevalence. It states explicitly that these differences arise from social factors rather than biological ones — differences in income, food environment and access to care, not in bodies.
The same question for other tests
Screening ages are set separately for every test, by different evidence, on different timetables. If you are working through more than one, the equivalent question for a cholesterol panel has its own answer and its own recent change.
🩺 Physician Note: Current guidance treats these factors as reasons for a clinician to look earlier, not as a scoring system a patient can total up. There is no threshold number of risk factors that qualifies you and no count that rules you out. Bringing the list to an appointment is more useful than trying to reach a verdict with it.
Children and teens are a separate question
The adult rules do not extend downward, and the two organizations genuinely differ here. A parent reading the adult sections should not carry any of those numbers across.
What the ADA recommends for children
Recommendation 2.15 of the 2026 Standards of Care advises that risk-based screening for prediabetes or type 2 diabetes should be considered after the onset of puberty or after age 10, whichever comes first. It applies to children and adolescents who have overweight or obesity and one or more risk factors for diabetes.
That is a risk-based recommendation, not a universal one. It does not mean every ten-year-old is screened; it means the question becomes appropriate at that point for children who meet the criteria.
What “insufficient evidence” means
In September 2022 the task force reviewed screening for prediabetes and type 2 diabetes in children and adolescents under 18 with no signs or symptoms, and issued what it calls an I statement: the current evidence is insufficient to assess the balance of benefits and harms.
An I statement is not a recommendation against screening. It means the evidence was not adequate to weigh the benefits against the harms in either direction — and in the same document the task force states that clinicians should use their clinical judgment to decide whether screening is appropriate for an individual patient.
What to ask a pediatrician
Bring the specific risk factors rather than the question in the abstract. A family history, a previous high result, or a clinician’s own observation will shape the answer more than a birthday will.
Parents working through a different childhood screening question may find cholesterol testing in children useful, since it follows a similar structure of one body recommending and another finding the evidence unsettled.
✅ Patient Action: Ask your pediatrician directly: “Does my child meet the risk-based criteria for diabetes screening, and if so which test would you use?” That question gets a clearer answer than asking at what age screening starts.
What a screening age cannot tell you
An age is an entry point to a conversation, not a verdict about your health. It is worth being clear about the edges of what any of these numbers can do.
An age is not a result
Screening exists precisely because prediabetes and type 2 diabetes often produce no symptoms at all. Meeting a start age tells you a test is appropriate; it says nothing about what the test will show, and missing one says nothing either.
If a test has already been done, how much confidence to place in a single figure is a genuine question with a real answer — covered in how precise the test actually is. If a result has already come back elevated, what happens next is a more useful page than this one.
The evidence behind the age is still open
The task force publishes a list of what it does not yet know, and one entry on it is the age at which to start and stop screening. The body whose recommendation determines your coverage says the starting age itself needs further clinical trials and modeling studies.
That is worth knowing rather than hiding. It is also the honest reason the conversation with a clinician matters more than the birthday: the number is a reasonable default, not a settled fact about you.
The upper end is genuinely unresolved between the two. The task force’s criteria stop at 70; the ADA’s recommendation names no upper bound. Nobody should read the task force’s range as an instruction that testing stops being useful at 71.
Why we do not recommend a home kit
This page does not recommend or link any at-home A1C product, and the reason is on the page. CDC’s guidance on when to get tested says that if you had your blood sugar tested at a health fair or pharmacy, you should follow up with your doctor, who may want to re-test you to make sure the result is accurate.
Recommending a product that contradicts a source we cite would not be honest. A screening result that a clinician will repeat anyway is not the same thing as a screening test.
⚠️ Clinical Warning: A result from a health fair, pharmacy or home kit should not be treated as a diagnosis or as a reason to skip a clinical test. It should also not be treated as an all-clear. Take the result to a physician and ask whether it needs repeating in a laboratory.
Questions people ask about the screening age
1. At what age should you start A1C testing?
Both current US guideline bodies place the start at 35. The ADA’s 2026 Standards of Care state that testing should begin no later than age 35 for all people, and the task force recommends screening adults aged 35 to 70 who have overweight or obesity. Which rule applies to you is worth confirming with your physician.
2. Does the CDC recommend screening at 45?
CDC does not publish 45 as a screening age. Its risk-factor list names being 45 or older as one of seven things that raise your risk of prediabetes and type 2 diabetes, and its patient testing page gives no age at all, directing readers to that risk list instead. The two pages answer different questions.
3. When did the diabetes screening age change to 35?
In two steps. The task force lowered its starting age from 40 to 35 in 2021, and the ADA lowered its own from 45 to 35 in 2022. CDC’s research summary records both changes, which is why material published before 2022 can still say 45 and have been accurate at the time.
4. Is diabetes screening covered by insurance?
Marketplace plans and many others must cover the listed preventive services without a copayment or coinsurance, even before the deductible is met. HealthCare.gov also states that coverage may vary and that $0 cost is not guaranteed in all cases. Confirm your own screening age eligibility with your plan’s member services before the appointment.
5. Why does the preventive list still say 40?
The federal preventive list currently names adults 40 to 70 with overweight or obesity, which is the age range from the task force’s 2015 statement. That statement was replaced in August 2021 by the 35 to 70 version. The list and the recommendation carry different dates, which is what produces the gap.
6. I am 50 and a healthy weight — do I still need screening?
A healthy weight places you outside the task force’s criteria, which carry a body-weight condition. It does not place you outside the ADA’s recommendation, which states that testing should begin at 35 for all people and names no weight condition. Being at a healthy weight is not an exemption; ask your physician which rule they apply.
7. Should I be screened before 35?
Possibly. Both bodies describe screening adults with overweight or obesity plus at least one additional risk factor regardless of age, and CDC’s risk list names those factors — including a parent or sibling with type 2 diabetes, physical inactivity, fatty liver disease, and a history of gestational diabetes. Bring the specific factors to your physician rather than a count.
8. At what age are children screened for type 2 diabetes?
The ADA’s Recommendation 2.15 advises considering risk-based screening after puberty begins or after age 10, whichever comes first, for children and adolescents with overweight or obesity plus one or more risk factors. It is risk-based, not universal. A pediatrician is the right person to confirm whether your child meets those criteria.
9. Does “insufficient evidence” mean children should not be screened?
No. The task force’s 2022 I statement means the evidence was not adequate to weigh the benefits against the harms in either direction — it is not a recommendation against screening. The same document states that clinicians should use their clinical judgment for the individual patient, and the ADA’s risk-based recommendation still stands.
10. Is there an upper age limit for A1C screening?
The two differ here: the task force’s criteria cover adults up to 70, while the ADA’s recommendation names no upper limit. Neither states that screening stops being useful after a particular birthday, and the task force lists the age at which to stop screening among the questions its own evidence has not settled. Ask your physician which applies to you.
11. Does a pharmacy or health-fair result count?
CDC advises that if your blood sugar was tested at a health fair or pharmacy, you should follow up with your doctor, who may want to re-test you to confirm the result is accurate. Treat such a result as a prompt to seek clinical testing, not as a diagnosis and not as an all-clear. Take the number to a physician.
What to do with this before your next visit
The useful action here is a question, not a purchase and not a checklist. Three of them, and they take a minute between them.
Ask your primary care physician which screening rule they are applying to you given your age and risk factors, and whether a screening test has already been done. Ask your plan’s member services, separately, whether a screening A1C is billed as preventive under your plan at your age. If you are asking on behalf of a child, ask a pediatrician whether they meet the risk-based criteria.
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.
