On This Page – Quick Medical Summary
What your A1C result can and can’t tell you right now
You are probably holding a number. Before anything else, here is where to go.
If your result landed near 5.7% or 6.5% — start here and read straight through. Those two figures are the boundaries between normal, prediabetes, and diabetes, and a result sitting close to either one is the single most misread situation in this whole topic. What follows explains why, and what happens next.
If you have just been told you have diabetes or prediabetes — the sections on what the number means, what target to aim for, and how often to retest are written for you. Nothing here will contradict your clinician; it is meant to make your next appointment more useful.
If you are tracking whether your number moved — go to the section on precision. A change from 7.4% to 7.1% may be a real improvement, and it may also sit inside the range a repeat measurement can produce on its own. That distinction is rarely explained anywhere, and it matters.
If you have been told the test may not be accurate for you — because of anemia, a kidney condition, a recent transfusion, or an inherited hemoglobin variant — the reliability section covers what to ask.
The A1C test is a good test. It is used to diagnose type 2 diabetes and prediabetes, and it is the main test used to follow diabetes over time. But a single A1C result is a measurement, and measurements come with a margin. Understanding that margin is not a reason to distrust your result. It is the reason your clinician may want a second one.
ℹ️ Medical Disclaimer: This article covers the diagnosis of diabetes and prediabetes, the interpretation of a personal laboratory result, individualized A1C target setting, treatment decisions that follow from those targets, screening timing and eligibility, testing during pregnancy, conditions that alter the reliability of the test, insurance and coverage decisions, and the limits of point-of-care and at-home testing devices. All of it is general education based on current clinical guidance — it is not a diagnosis, and it cannot interpret your particular result. Your history, your other test results, your medications, and your clinician’s assessment all change what your number means for you. Consult your primary care clinician or an endocrinologist before acting on anything here.
What the A1C test actually measures
Your A1C is not a blood sugar reading. It is a measure of how much sugar has attached itself to a protein inside your red blood cells, built up over the life of those cells.
🔬 How It Works: Hemoglobin is the protein in your red blood cells that carries oxygen. When glucose circulates in your blood, some of it binds to that hemoglobin and stays bound. The glycated hemoglobin test measures how much of your hemoglobin has glucose attached, and reports it as a percentage. The more glucose has been in your bloodstream, the higher that percentage climbs.
Why the window is about three months
Red blood cells live roughly three months. Because the glucose stays attached for the life of the cell, the measurement reflects your average blood glucose across that period rather than any single moment.
That is what makes it useful. A finger-stick reading tells you about one instant; this tells you about a season.
Why the last 30 days count for more
Here is a detail almost every explanation leaves out. NIDDK states plainly that blood glucose levels within the past 30 days have a greater effect on the A1C reading than levels in the previous months.
It is not a flat three-month average. It is weighted toward the recent past.
This matters in both directions. If you changed something six weeks ago, it is already showing. If last month was difficult, that shows too — and it does not erase the two months before it.
What the percentage is a percentage of
The number on your report is the proportion of your hemoglobin carrying attached glucose. It is not milligrams, not a blood sugar level, and not directly comparable to what your meter shows.
That mismatch confuses a great many people, and there is a translation for it — covered further down. For a plain-language overview of the test itself, MedlinePlus maintains a straightforward explanation of the hemoglobin A1C test.
A1C levels: normal, prediabetes, and diabetes
These are the numbers you came for. They are set out below exactly as NIDDK publishes them.
| Result | A1C level |
|---|---|
| Normal | Below 5.7% |
| Prediabetes | 5.7% to 6.4% |
| Diabetes | 6.5% or above |
Source: NIDDK, The A1C Test & Diabetes. Any test used to diagnose diabetes requires confirmation with a second measurement, unless clear symptoms of diabetes are present.
Why 6.5% itself counts as diabetes
The diagnostic threshold is 6.5 percent or above. A result of exactly 6.5% meets it.
This is worth stating precisely because the wording varies across published sources, and some phrase it as “above 6.5%” — which can read as excluding a result that sits exactly on the line. It does not. The criterion includes 6.5%.
What prediabetes does and doesn’t mean
A result between 5.7% and 6.4% is not diabetes. It is a risk factor for developing type 2 diabetes — and NIDDK notes that within that band, the higher the A1C, the greater that risk.
So 5.8% and 6.3% are not the same message, even though both are labelled the same way. If your result landed in this range, there is a specific sequence clinicians work through next, and it is worth knowing what doctors check next in the 5.7 to 6.4 range.
How common these results are
📊 Clinical Data Point: The CDC’s National Diabetes Statistics Report, updated 21 January 2026, estimates that 40.1 million people in the United States had diabetes in 2023 — 12.0% of the population. Of adults with diabetes, 27.6% are undiagnosed, representing 11.0 million people. A further 115.2 million US adults have prediabetes, and the CDC reports that 8 in 10 adults with prediabetes do not know they have it.
Those figures are the reason screening exists at all, and you can read how many US adults have diabetes and prediabetes in full.
One important limit on this table. NIDDK states that the A1C test should not be used to diagnose type 1 diabetes, gestational diabetes, or cystic fibrosis–related diabetes. Gestational diabetes is checked with a glucose challenge or tolerance test, usually between 24 and 28 weeks of pregnancy. A1C may be used early in pregnancy for a different purpose — to see whether someone with risk factors had undiagnosed diabetes before conceiving.
How precise is your A1C number?
The A1C test is precise enough to diagnose diabetes. It is not exact. Understanding the difference is the most useful thing on this page.
📊 Clinical Data Point: NIDDK states that when repeated, an A1C result can come back slightly higher or lower than the first measurement — an A1C reported as 6.8% could be reported anywhere from 6.4% to 7.2% on a repeat test of the same blood sample. That imprecision is exactly why a diagnosis requires confirmation with a second measurement, unless clear symptoms of diabetes are present.
Read those two sentences together, because they belong together. The margin is not a reason to dismiss your result — it is the reason the confirmation step exists.
What “the same sample, twice” actually shows
The comparison above is not two blood draws on two days. It is the same blood, measured twice.
Even in one laboratory, small differences in temperature, equipment, and sample handling shift the result slightly. NIDDK notes these factors actually affect glucose measurements — fasting and tolerance tests — more than they affect A1C.
And the picture has improved. NIDDK is explicit that this range used to be larger, and that newer, stricter quality-control standards have made A1C results more precise than they once were.
Why the band matters most near 5.7% and 6.5%
If your result is 8.2%, a margin of a few tenths changes nothing about what happens next.
If your result is 6.6%, it changes a great deal. A margin that size can straddle a diagnostic threshold — which is precisely the situation the confirmation requirement was designed for.
An NIDDK-published expert interview on A1C variability describes the practical version of this: results comfortably below or above the boundaries carry little risk of misclassification, while results in the middle band are the ones worth confirming with additional glucose testing. The same interview puts it bluntly — a diagnosis of diabetes should not be made on one test.
If you are watching your number move
This is the question no one answers for people already living with diabetes. Your A1C went from 7.4% to 7.1%. Is that real?
Honestly: a change of that size sits within the range a repeat measurement can produce on its own. That is not a rule for ignoring changes, and it is not a threshold — it is a reason clinicians read a trend across several results rather than reacting to one move.
Repeat testing is routine across laboratory medicine, not something unique to A1C or a sign that anything went wrong. It is worth understanding when a blood test result gets repeated more generally.
NIDDK’s own patient page on A1C — last reviewed in 2018, and still the clearest federal statement on this point — sets out the precision of the A1C test in detail.
✅ Patient Action: Ask your primary care clinician or endocrinologist: “Was this result confirmed with a second test, and if not, when should I have one?”
What happens after a high or borderline A1C
Being sent back for another blood test can feel like being doubted. It is not. It is the standard path, and here is what it looks like.
- A repeat test on a different day. NIDDK states that if you have no symptoms but your A1C shows diabetes or prediabetes, you should have a repeat test on a different day — using A1C again, or one of the other diabetes tests.
- Or no repeat at all. If clear symptoms of diabetes are present, confirmation with a second measurement is not required.
- Sometimes a different test entirely. Your clinician may use a fasting or tolerance test to confirm, rather than repeating the A1C.
- Sometimes watchful waiting. If two tests disagree, clinicians may follow you closely and repeat testing in several months.
When two tests disagree
This happens, and it is recognised. NIDDK describes both directions: a blood glucose test can indicate diabetes when A1C does not, and A1C can indicate diabetes when a glucose test does not.
It is not a laboratory error and it is not your fault. People with differing results may simply be at an early stage, where glucose has not yet risen enough to show up on every test.
That is the reason clinicians repeat tests before making a diagnosis at all.
✅ Patient Action: Ask your primary care clinician: “Which test are you using to confirm this, and do I need to fast for it?”
A1C vs fasting glucose and the other diabetes tests
Four blood tests are used to diagnose diabetes and prediabetes. None is a replacement for the others; each answers a slightly different question.
| Test | What it measures | Fasting needed | Key clinical detail |
|---|---|---|---|
| A1C | Average glucose over ~3 months | No | Can be drawn any time of day; less affected by short-term swings |
| Fasting plasma glucose | Glucose after an overnight fast | Yes — at least 8 hours | A single-moment measurement |
| Oral glucose tolerance test | Glucose before and after a glucose drink | Yes — at least 8 hours | Takes several hours; checks how your body handles a load |
| Random plasma glucose | Glucose at the moment of testing | No | Used mainly when symptoms of diabetes are present |
Source: NIDDK, The A1C Test & Diabetes; CDC, Diabetes Testing.
Why A1C is used so often
No fasting, any time of day, one tube of blood. That convenience is a genuine clinical advantage, not a compromise — it removes a real barrier to people getting screened at all.
It also has a specific strength: NIDDK notes A1C is less affected by short-term changes than the fasting or tolerance tests, because it is not measuring a single moment.
What the glucose tests do better
They catch what an average smooths over. If you want the detail on the fasting side, see what a normal fasting glucose result looks like — the reference numbers live there rather than here, because a glucose range and an A1C range are not interchangeable and printing them side by side invites exactly the confusion this article is trying to prevent.
You can read more on how diabetes is tested for at the CDC.
One practical note: A1C is not part of a standard metabolic panel. A normal panel does not rule out diabetes, which is covered in whether a routine metabolic panel can detect diabetes.
What eAG means on your lab report
Some laboratories print a second figure beside your A1C: estimated average glucose, or eAG. It exists to translate a percentage into the units you already recognise from a meter.
🔬 How It Works: eAG is calculated from your A1C using a published relationship established by the A1C-Derived Average Glucose study, reported by the National Glycohemoglobin Standardization Program as eAG in mg/dL = (28.7 × A1C) − 46.7. It is arithmetic performed on your existing result — not a separate measurement.
The values below are calculated directly from that formula:
| A1C | eAG (mg/dL) | eAG (mmol/L) |
|---|---|---|
| 5.0% | 97 | 5.4 |
| 5.7% | 117 | 6.5 |
| 6.5% | 140 | 7.8 |
| 7.0% | 154 | 8.6 |
| 8.0% | 183 | 10.2 |
| 9.0% | 212 | 11.8 |
Calculated from the ADAG study relationship published by the NGSP. Values rounded to the nearest whole number.
If your meter or laboratory reports in different units, you can switch that figure between mg/dL and mmol/L to compare like with like.
Why eAG won’t match your meter’s average
NIDDK is direct about this: the eAG number will not match your daily readings, because it is a long-term average rather than a measurement at a single moment.
Your meter catches the times you chose to test. Your A1C catches everything, including the hours you slept.
Why eAG is also a range, not a number
Here is the part almost nobody prints. The relationship between A1C and average glucose was derived from a study of 507 participants across ten international centres, and the NGSP reports its correlation as r² = 0.84.
In plain terms: the formula explains most of the variation between people, but not all of it. Two people with identical A1C values can genuinely have somewhat different average glucose.
So eAG is a good translation, not an exact conversion. It is an estimate — the name says so — and it inherits the same honest limitation as the A1C it comes from.
When the A1C test isn’t reliable for you
For most people the A1C is dependable. For a meaningful minority it is not — and the conditions involved are more common than most readers expect.
⚠️ Clinical Warning: NIDDK identifies several situations in which an A1C result can be falsely high or falsely low: inherited hemoglobin variants; very low iron, including iron-deficiency anemia, which can produce a falsely high result; kidney failure; liver disease; and conditions that change the lifespan of red blood cells, including recent blood loss, sickle cell disease, erythropoietin treatment, hemodialysis, and blood transfusion. If any of these apply to you, your A1C may not mean what a standard reading of it would suggest.
Inherited hemoglobin variants
Some people carry a form of hemoglobin that differs from the most common type. NIDDK notes these variants are more likely in people of African, Mediterranean, or Southeast Asian descent, or with family members who have sickle cell anemia or thalassemia.
Certain variants interfere with some A1C testing methods — not with the concept of the test, and not with every laboratory’s assay.
Most people who carry a hemoglobin variant have no symptoms and do not know they carry it. That is the unsettling part, and here is the reassurance that belongs beside it: reliable A1C tests exist for most hemoglobin variants, and the NGSP publishes which assay methods are appropriate for which variants. If one method gives a false result, a different method can be used.
NIDDK maintains a dedicated page on how inherited hemoglobin variants affect the test.
Anemia, iron levels and blood loss
Very low iron can push an A1C result higher than your actual average glucose warrants. Recent blood loss can move it the other way.
If anemia is part of your history, the way it shows up on other tests is covered in how anemia shows up on a blood count.
Iron status is measured separately from either, and interpreting those results is its own subject — see what abnormal iron studies mean.
Kidney disease, liver disease, dialysis and transfusion
NIDDK lists kidney failure and liver disease among the causes of false A1C results, and separately identifies hemodialysis, erythropoietin treatment, and recent transfusion as conditions that change red cell lifespan and therefore change A1C.
None of this means you cannot be tested. It means the result needs to be read alongside the rest of your clinical picture rather than on its own.
The signal that something is interfering
NIDDK describes the practical clue clinicians use: when A1C results and blood glucose results do not match, interference should be considered.
That is a concrete thing you can notice yourself and raise.
✅ Patient Action: Ask your clinician or the ordering laboratory: “Does anything in my history — a hemoglobin variant, anemia, kidney disease, a recent transfusion — mean my A1C could be misleading, and does this lab’s method account for it?”
Why your A1C doesn’t match your glucose meter
Your meter says your readings average about 130. Your A1C says 7.5%, which converts to roughly 169. One of them must be wrong.
Usually neither is.
An average and a moment are different measurements
Your meter records the times you chose to test. That is rarely a random sample — most people test fasting, or before meals, which are typically their lower readings of the day.
Your A1C includes the hours after every meal and every night you slept. It is not sampling; it is cumulative.
Add the 30-day weighting covered earlier, and a recent difficult stretch can lift an A1C that your current readings do not reflect.
When the mismatch is worth investigating
Sometimes the gap is not explainable by sampling. That is the point at which the reliability section above becomes relevant, because a persistent mismatch between meter readings and A1C is exactly the clue NIDDK describes for interference.
A single high or low reading on its own is a different question — see what a single high glucose reading actually means.
✅ Patient Action: Bring your meter or continuous monitor download to your appointment and ask: “My readings average around X but my A1C says Y — is that gap expected for me, or worth looking into?”
What A1C target is right after a diagnosis
There is a number most people have heard, and it is not a universal target.
Where the below-7% figure comes from
NIDDK states that studies have shown some people with diabetes can reduce the risk of diabetes complications by keeping A1C levels below 7 percent, and that managing glucose early in the course of diabetes may provide benefits for years afterwards.
That is a real, evidence-based figure. It is also not a target for everyone.
When a higher target is the safer choice
🩺 Physician Note: Current guidance is explicit that an A1C level safe for one person may not be safe for another. NIDDK notes that keeping A1C below 7 percent may not be safe if it leads to hypoglycemia, and that less strict control — an A1C between 7 and 8 percent, or higher in some circumstances — may be appropriate for people with limited life expectancy, long-standing diabetes and difficulty reaching a lower goal, severe hypoglycemia or an inability to sense it, or advanced complications such as chronic kidney disease, nerve problems, or cardiovascular disease.
If your clinician has set your target above 7%, that is very often a deliberate decision to protect you from low blood sugar — which carries its own serious and immediate risks. It is not a sign that anyone has given up.
A1C is no longer the only measure
For people using a continuous glucose monitor, current American Diabetes Association guidance describes assessing glycemic status using A1C and/or monitor-derived metrics such as time in range. Those metrics are tools for managing diabetes; A1C remains a diagnostic criterion. The two are not interchangeable, and pages that suggest one has replaced the other are collapsing a distinction that matters.
✅ Patient Action: Ask your clinician or endocrinologist: “What A1C target are we aiming for in my case, and what made you choose that number rather than a lower one?”
Who should get an A1C test, and at what age
Three current US authorities recommend three different things. This is not a mistake in any of them — they are answering different questions — but the difference has consequences, so here is all of it.
| Authority | Who should be tested | From what age | Key detail |
|---|---|---|---|
| CDC | Adults with risk factors | 45 or older; younger with prediabetes, overweight or obesity, or a parent or sibling with type 2 diabetes | Framed as risk factors for prediabetes |
| ADA (2026 Standards of Care) | All adults; also any adult with overweight or obesity plus one or more risk factors | No later than 35 | Repeat screening at minimum 3-year intervals if normal |
| USPSTF (2021) | Adults with overweight or obesity only | 35 to 70 | Every 3 years; replaced the earlier 40-to-70 recommendation |
Sources: CDC screening guidance as summarised by MedlinePlus; American Diabetes Association, Standards of Care in Diabetes—2026; US Preventive Services Task Force, 2021 recommendation statement.
Why they don’t agree
The CDC is describing risk factors for the general public. The ADA is writing clinical practice guidance for clinicians. The USPSTF is assessing where the evidence for population screening is strongest, which is a deliberately higher bar.
All three are current. None supersedes the others.
What it means for you
If you are 38 and at a healthy weight, the ADA’s guidance says test and the USPSTF’s does not. That is a genuine gap, and the next section explains why it can show up on a bill.
Your own risk profile matters more than any single age cut-off. If several risk factors apply to you, that is worth raising regardless of your age — the cluster of signs that raises diabetes risk covers what those look like together, and what’s typically included in annual blood work covers whether A1C is likely to already be on your yearly draw.
✅ Patient Action: Ask your primary care clinician: “Based on my risk factors, should I be screened now — and which guideline are you following?”
What an A1C test costs and when it’s covered
Coverage for preventive screening in the US is tied to one specific body’s recommendations, and it is not the one most clinical guidance follows.
How preventive coverage is decided
Under the Affordable Care Act, most plans must cover services recommended by the US Preventive Services Task Force without cost-sharing. The USPSTF recommends diabetes screening for adults aged 35 to 70 who have overweight or obesity.
The ADA recommends testing all adults from age 35 regardless of weight.
The gap between guideline and coverage
Those two rules do not describe the same people. A 36-year-old at a healthy weight meets the ADA’s recommendation and falls outside the USPSTF’s — and it is the USPSTF’s that the no-cost-sharing requirement follows.
This does not mean the test is unavailable or unaffordable. It means it may be processed differently, and that is worth knowing before the draw rather than after.
Preventive versus diagnostic
There is a second distinction that catches people out. A test ordered as screening and a test ordered to investigate a symptom or follow a known condition can be coded differently, and coded differently they can be billed differently.
That mechanism is not unique to A1C, and it is explained in why preventive blood work sometimes arrives with a bill.
⚠️ Clinical Warning: Coverage rules vary by plan, and no article can tell you what yours covers. Do not let uncertainty about a bill delay a test your clinician thinks you need — ask the question below instead, and ask it before the blood is drawn.
✅ Patient Action: Ask the ordering office: “Is this being coded as preventive screening or as diagnostic, and do you know whether my plan covers it either way?”
Where to get an A1C test and how to prepare
Not every A1C is the same test, and the difference decides what the result can be used for.
The standard laboratory draw
For diagnosis, NIDDK is specific: the sample is drawn from a vein and sent to a laboratory using an NGSP-certified method. That certification exists so results from different laboratories are consistent and comparable.
No preparation is needed. You do not have to fast for an A1C test, and blood can be drawn at any time of day.
If you are fasting anyway, it is usually for something else being drawn the same morning — which blood tests actually require fasting covers which ones do.
Finger-stick tests at the clinic, pharmacy, or health fair
These are real tests and they give real information. They are not diagnostic.
NIDDK states directly that blood samples analysed in a doctor’s office or clinic — point-of-care tests — should not be used for diagnosis. Current ADA guidance takes the same position unless the specific assay is approved for diagnostic use in an appropriately certified laboratory.
The CDC’s advice is the practical version: if you had your blood sugar tested at a health fair or pharmacy, follow up with your doctor, who may want to re-test to make sure the result is accurate.
At-home and mail-in kits
Two different products are often discussed as one. A finger-stick device you use at home carries the same limitation as the one at the pharmacy counter — the manufacturer of one widely sold device states in its own labelling that it is not for the screening or diagnosis of diabetes. A mail-in kit processed by a certified laboratory is a different arrangement with different limitations.
We do not recommend or link to any home A1C product on this page. The sources this article is built on say point-of-care results should not be used for diagnosis and that a health-fair result should be followed up with a clinician. Recommending a product that contradicts our own cited sources would not be honest, so we don’t.
✅ Patient Action: If a finger-stick or home test showed 5.7% or higher, book a laboratory A1C with your clinician and ask specifically for a venous draw.
A1C test questions people ask most
1. What is a normal A1C level?
A normal A1C level is below 5.7%, according to NIDDK. A result from 5.7% to 6.4% indicates prediabetes, and 6.5% or above indicates diabetes. These bands apply to the test used for diagnosis in non-pregnant adults. A single result near a boundary does not settle the question on its own — confirmation with a second measurement is required unless clear symptoms are present. Discuss your result with your clinician.
2. What A1C level is considered diabetic?
An A1C of 6.5% or above meets the diagnostic criterion for diabetes, per NIDDK. The threshold includes exactly 6.5% — a result on the line qualifies, even though some sources word it as “above 6.5%.” A diagnosis still requires confirmation with a second measurement unless you have clear symptoms of diabetes. Your clinician will decide which test to use for that confirmation.
3. How accurate is the A1C test?
The A1C test is precise enough to diagnose diabetes but is not exact. NIDDK notes that a result reported as 6.8% could come back anywhere from 6.4% to 7.2% on a repeat test of the same blood sample. That measurement margin is precisely why a diagnosis requires a second test. NIDDK also notes that stricter quality-control standards have made A1C results more precise than they once were.
4. Can an A1C test be wrong?
An A1C result can be misleading in specific circumstances. NIDDK identifies inherited hemoglobin variants, very low iron including iron-deficiency anemia, kidney failure, liver disease, recent blood loss, transfusion, erythropoietin treatment, and hemodialysis as causes of falsely high or falsely low results. If any apply to you, ask your clinician whether your laboratory’s testing method accounts for it.
5. Do you have to fast for an A1C test?
No. NIDDK confirms you do not need to fast before an A1C test, and blood can be drawn at any time of day. This is one reason the test is used so widely for screening. If you have been asked to fast, it is usually for a different test being drawn at the same appointment, such as a fasting glucose or lipid panel.
6. Can one high A1C mean diabetes?
Usually not on its own. NIDDK states that if you have no symptoms but your A1C indicates diabetes or prediabetes, you should have a repeat test on a different day using A1C or another diabetes test. Confirmation is not required when clear symptoms of diabetes are present. Ask your clinician which test they will use to confirm.
7. What can falsely raise your A1C?
NIDDK identifies very low iron, including iron-deficiency anemia, as a cause of falsely high A1C results. Kidney failure and liver disease are also listed as causes of false results, and certain inherited hemoglobin variants can push results high or low depending on the testing method used. Raise any of these with your clinician before your result is interpreted.
8. Does anemia affect A1C?
Yes. NIDDK states that a falsely high A1C result can occur in people who are very low in iron, such as those with iron-deficiency anemia. Separately, conditions that shorten red blood cell lifespan — including recent blood loss and sickle cell disease — can change A1C levels. If you have a history of anemia, tell your clinician before your A1C is interpreted.
9. Why doesn’t my A1C match my glucose meter?
Because they measure different things. NIDDK notes that estimated average glucose from an A1C will not match daily readings, since it reflects a long-term average rather than a single moment. Meter readings also tend to cluster at times you choose to test. A persistent, unexplained mismatch can be a clue to interference and is worth raising with your clinician.
10. Does the A1C test diagnose type 1 diabetes?
No. NIDDK states explicitly that the A1C test should not be used to diagnose type 1 diabetes, gestational diabetes, or cystic fibrosis–related diabetes. MedlinePlus notes A1C may still be used to monitor blood glucose in people with type 1 diabetes. Diagnosis of type 1 involves different testing, including autoantibody tests. Speak to your clinician about which tests apply to your situation.
What to do before your next appointment
You arrived holding a number. You now hold a number and the margin around it — which is a more honest picture, and a more useful one.
Nothing here changes what your result is. What it changes is what you do with it: a borderline A1C is a reason to complete the next step rather than to panic or to dismiss it, and a small movement in either direction is best read as part of a trend rather than a verdict.
The one thing worth doing this week
If your result was 5.7% or higher and has not been confirmed, book that confirmation. That single action matters more than anything else on this page.
✅ Patient Action: Ask your primary care clinician: “Has this result been confirmed with a second test — and if not, when should that happen?” If anything in your history could affect the test’s reliability, raise it in the same conversation.
Take this with you. Our one-page guide, Your A1C Result: 6 Questions to Ask at Your Next Appointment, has space to record your first result alongside the confirmation, plus the reliability questions worth asking. It is free.
Where to read next
If your result sits in the prediabetes band, read what doctors check next in the 5.7 to 6.4 range. If you are wondering why A1C did not appear on your routine panel, read whether a routine metabolic panel can detect diabetes. If a mismatch with your meter is what brought you here, start with what a single high glucose reading actually means.
How this article was made. Every clinical figure above is cited to the authority that publishes it — NIDDK, the CDC, MedlinePlus, and the current American Diabetes Association and US Preventive Services Task Force recommendations. Where a source is dated, we say so. Where a figure could not be verified, we left it out rather than estimating. No physician has reviewed this article, and we do not claim otherwise — the byline reads “fact-checked,” not “medically reviewed,” because that is what happened.
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.