Guide
A1C Test Guide: What 5.7% and 6.5% Mean for Your Blood Sugar
An A1C below 5.7% is normal, 5.7% to 6.4% is prediabetes, and 6.5% or higher is diabetes. For fasting glucose the cutoffs are 100 and 126 mg/dL (NIDDK, Diabetes & Prediabetes Tests). A diagnosis needs a repeat test and a clinician. No supplement, Olivaro included, can change what the lab result means.
Written by the Olivaro research deskUpdated
The basics
What does an A1C test measure?
A1C is a percentage. It shows how much of your hemoglobin, the protein in red blood cells, has sugar stuck to it.
Red blood cells live for a few months. So A1C reflects your average blood sugar over that stretch, not just one morning. You do not need to fast for it.
Fasting glucose is different. It is a snapshot taken after you have not eaten, usually overnight. It is reported in mg/dL. One reading can swing with sleep, stress or illness, which is why it is often repeated.
| Feature | A1C | Fasting glucose |
|---|---|---|
| Unit | % | mg/dL |
| Time covered | The past few months, on average | That moment |
| Fasting needed | No | Yes |
| Best use | Seeing the long trend | Seeing a single fasting level |
A third test, the 2-hour oral glucose tolerance test, measures how fast you clear a sugar drink. It shows up in the ranges below.
NIDDK ranges
What are normal, prediabetes and diabetes A1C ranges?
Normal A1C is below 5.7%. Prediabetes runs from 5.7% to 6.4%, and diabetes starts at 6.5% (NIDDK, Diabetes & Prediabetes Tests).
- NormalA1CBelow 5.7%Fasting glucose99 mg/dL or below
- PrediabetesA1C5.7% to 6.4%Fasting glucose100 to 125 mg/dL
- DiabetesA1C6.5% or higherFasting glucose126 mg/dL or higher
Ranges from NIDDK (NIDDK, Diabetes & Prediabetes Tests). Only a lab test and a clinician can diagnose. Low blood sugar is generally below 70 mg/dL (NIDDK, Low Blood Glucose).
| Result | A1C | Fasting glucose | 2-hour glucose test |
|---|---|---|---|
| Normal | Below 5.7% | 99 mg/dL or below | Below 140 mg/dL |
| Prediabetes | 5.7% to 6.4% | 100 to 125 mg/dL | 140 to 199 mg/dL |
| Diabetes | 6.5% or higher | 126 mg/dL or higher | 200 mg/dL or higher |
Home meters and lab tests are not the same. Only a lab result read by a clinician counts for diagnosis.
CDC 2026
How many Americans have diabetes in 2026?
About 40.1 million people in the U.S. have diabetes, or 12.0%. Roughly 11 million of them do not know it (CDC, National Diabetes Statistics Report).
CDC National Diabetes Statistics Report, 2026 update using 2023 data. Older figures still quoted online are out of date.
Who
Who should get an A1C or fasting glucose test?
Anyone with symptoms of high blood sugar should ask for a test soon. Many others are tested at routine checkups, based on age and risk.
You have symptoms
The CDC lists frequent urination, thirst, hunger, unplanned weight loss, tiredness, blurry vision and slow-healing sores (CDC, Symptoms of Diabetes). Tingling in the hands or feet also counts.
You have risk factors
Your doctor weighs age, weight, family history, activity and past results. Ask directly whether you are due for a test.
You already have a result
Prediabetes and diabetes are followed over time. Your doctor sets the schedule that matches your treatment.
Remember that about 11 million adults with diabetes are undiagnosed. A simple blood test is how that number shrinks.
How often
How often should you get your A1C checked?
Follow your doctor's schedule. The right interval depends on your last result, your treatment and how stable your numbers are.
We do not print a fixed timetable, because one does not fit everyone. Instead, use the table to start the conversation.
| Your situation | What to ask |
|---|---|
| Normal result, no symptoms | When should I be tested again? |
| Prediabetes range | When will we recheck, and what should change before then? |
| Diabetes, stable | How often do you want my A1C, and what is my target? |
| Diabetes, recent medicine change | When will we see whether the change worked? |
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Is prediabetes reversible with lifestyle changes?
Risk can drop a lot. In the Diabetes Prevention Program, aiming for 7% weight loss and 150 minutes of activity a week cut the risk of type 2 diabetes by 58% (NIDDK, Diabetes Prevention Program).
- 58%
Lower risk with the lifestyle program, compared with placebo.
- 71%
Lower risk in people 60 and older in that program.
- 31%
Lower risk with metformin, for comparison.
For a 200-pound person, 5% to 7% is about 10 to 14 pounds (CDC, Prediabetes). The CDC also runs a National Diabetes Prevention Program with coaches. More detail is in our DPP article.
Supplements
Can a supplement like Olivaro change your A1C diagnosis?
No. A diagnosis comes from lab tests and a clinician. A dietary supplement cannot rewrite it, and none is proven to treat diabetes (NCCIH, Diabetes and Dietary Supplements).
- The ADA finds no supplement proven to lower blood glucose when you have no deficiency (ADA, Vitamins & Supplements).
- Olivaro gives 0.7 to 1.4 mcg of chromium a day. Chromium studies used 200 to 1,000 mcg (NIH ODS, Chromium).
- Pooled ginseng trials showed no significant effect on A1C (Shishtar et al., PLoS One 2014).
- No study of Olivaro itself has been published.
The brand's sales page describes "nutritional support for glucose metabolism". That is a supplement claim, not a treatment claim. Talk to your doctor before you change any diabetes medicine. If you use insulin or a sulfonylurea, know the signs of a low: shakiness, sweating, hunger, confusion (NIDDK, Low Blood Glucose). The safety page lists each ingredient's flags.
At the visit
What should you ask when you get your A1C result?
Ask what the number means for you, not just which range it falls in. Then ask what to do before the next test.
About the number
- Was this a lab A1C or a fingerstick?
- Do we need a second test to confirm?
- Could anemia or another condition skew it?
About next steps
- What is my personal target?
- Would a lifestyle program help me?
- Should I tell you about any supplement first?
For a full printable list, use our doctor questions checklist. To check a product before that visit, see how to read a supplement label.
Bottom line
A1C in three sentences
A1C is a months-long average; fasting glucose is a snapshot. The lines are 5.7% and 6.5%, or 100 and 126 mg/dL. Lifestyle change has the strongest data for moving those numbers, and your doctor reads the result, not a supplement bottle.
FAQ
A1C test questions people ask
What is a normal A1C level?
A normal A1C is below 5.7%, according to NIDDK. A result from 5.7% to 6.4% falls in the prediabetes range, and 6.5% or higher is in the diabetes range. Your doctor confirms any diagnosis with a repeat test before calling it diabetes.
Is an A1C of 6.0% bad?
An A1C of 6.0% falls in the prediabetes range, which runs from 5.7% to 6.4%. It is a warning sign, not a diabetes diagnosis. Lifestyle programs cut type 2 diabetes risk by 58% in the DPP, so ask your doctor about a plan and a recheck date.
Do you have to fast for an A1C test?
No. An A1C test does not require fasting because it reflects your average blood sugar over the past few months. A fasting glucose test does require going without food beforehand, usually overnight. Ask your clinic which tests are on your order before the visit.
What fasting blood sugar level means diabetes?
A fasting glucose of 126 mg/dL or higher is in the diabetes range, and 100 to 125 mg/dL is prediabetes. A single reading is not enough. A diagnosis requires confirmation, usually a second test, read by a clinician who knows your history.
Can Olivaro lower my A1C?
No study shows that. Olivaro has never been tested in a published trial, its chromium is far below studied amounts, and pooled ginseng trials showed no A1C effect. It is a dietary supplement, not a diabetes medicine, and it cannot change a lab diagnosis.
How many people in the U.S. have prediabetes?
An estimated 115.2 million U.S. adults have prediabetes, according to the CDC's 2026 report using 2023 data. The same report counts 40.1 million people with diabetes, about 11 million of them undiagnosed. Many people with prediabetes do not know they have it.
How often should I check my A1C if I have prediabetes?
Follow the schedule your doctor sets. It depends on your last result, your other risk factors and any changes you are making. Ask at the visit when the next test should be and what you should work on before then, so the recheck has a clear purpose.
Who wrote this
Written and reviewed by
We start from the bottle label, then check every claim against government and peer-reviewed sources linked on the page.
Last updated . Read our editorial standards and how we check reviews. This website is run by an authorized U.S. retailer, not by the manufacturer. We earn money when you buy through our order links.
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