Guide: numbers
Blood Sugar Numbers Explained: Normal A1C, Fasting Glucose and Early Signs
Blood sugar numbers fall into three NIDDK ranges. Normal is an A1C below 5.7% or fasting glucose below 100 mg/dL; prediabetes is 5.7-6.4% or 100-125 mg/dL; the diabetes range is 6.5% or 126 mg/dL and up. One high result needs a repeat test before any diagnosis, and no supplement changes how the ranges are read.
Written by the Sugar Defender label deskUpdated
The ranges01
What are normal blood sugar numbers?
Normal blood sugar numbers are an A1C below 5.7% and a fasting glucose below 100 mg/dL, according to NIDDK (NIDDK, Diabetes & Prediabetes Tests).
Anything from 5.7% to 6.4%, or 100 to 125 mg/dL fasting, is prediabetes.
An A1C of 6.5% or a fasting result of 126 mg/dL or more is in the diabetes range.
Type your own result into the finder to see where it falls.
- Normal rangeA1C below 5.7%Fasting below 100 mg/dL
- PrediabetesA1C 5.7-6.4%Fasting 100-125 mg/dL
- Diabetes rangeA1C 6.5% or higherFasting 126 mg/dL or higher
Type an A1C or a fasting number to see its range. One reading is not a diagnosis; a doctor confirms it with a repeat test.
Ranges from NIDDK (NIDDK, Diabetes & Prediabetes Tests). About 115.2 million U.S. adults have prediabetes, and many of them do not know it (CDC, National Diabetes Statistics Report). A home meter cannot diagnose anything.
Three tests02
What does each blood sugar test measure?
Blood sugar numbers come from three main lab tests: the A1C, fasting plasma glucose and the 2-hour oral glucose tolerance test.
The A1C is read as a percent, while the two glucose tests are read in mg/dL.
Each test has its own cutoffs, so a number only makes sense next to the right row.
| Test | Normal | Prediabetes | Diabetes range |
|---|---|---|---|
| A1C | Below 5.7% | 5.7-6.4% | 6.5% or higher |
| Fasting plasma glucose | Below 100 mg/dL | 100-125 mg/dL | 126 mg/dL or higher |
| 2-hour glucose tolerance | Below 140 mg/dL | 140-199 mg/dL | 200 mg/dL or higher |
Source: NIDDK (NIDDK, Diabetes & Prediabetes Tests). A diabetes diagnosis needs confirmation, so a doctor reads these numbers together with a second test.
Fasting glucose03
Which fasting blood sugar numbers mean prediabetes?
Fasting blood sugar numbers from 100 to 125 mg/dL mean prediabetes, per NIDDK (NIDDK, Diabetes & Prediabetes Tests).
Under 100 counts as normal; 126 and up falls in the diabetes range.
About 115.2 million U.S. adults have prediabetes (CDC, National Diabetes Statistics Report).
Say your fasting result is 108 mg/dL. That is 8 points over the normal cutoff and 18 points under the diabetes cutoff. It sits in the prediabetes band. Your doctor will likely repeat it or add an A1C before calling it anything.
Prediabetes is the stage where habits matter most. In a large federal trial, a lifestyle program cut the risk of type 2 diabetes by 58% (NIDDK, Diabetes Prevention Program). The insulin resistance guide covers what that program asked people to do.
Symptoms04
What are the early signs of high blood sugar?
High blood sugar numbers can show up as frequent urination, more thirst and hunger, weight loss without trying, tiredness, blurry vision and frequent infections, per the CDC (CDC, Symptoms of Diabetes).
Type 2 diabetes can also bring sores that heal slowly and numb or tingling hands or feet.
Many people notice nothing at all. About 11.0 million U.S. adults have diabetes and do not know it (CDC, National Diabetes Statistics Report).
Signs the CDC lists
- Peeing often
- Feeling very thirsty
- Feeling very hungry, even after eating
- Losing weight without trying
- Feeling very tired
- Blurry vision
Also seen in type 2
- Cuts or sores that heal slowly
- Numbness or tingling in the hands or feet
The CDC also lists frequent infections for all types. Any of these is a reason to ask for a test, not to guess.
Repeat tests05
Why do blood sugar numbers need a repeat test?
Blood sugar numbers need a repeat test because NIDDK says a diabetes diagnosis requires confirmation (NIDDK, Diabetes & Prediabetes Tests).
One high result alone is not enough, so the same test or a different one is run again.
How often you test after that is a choice for you and your doctor, based on your results and any medicine you take.
First result is high
Write down the test, the number and the date. Ask which range it falls in.
Second test confirms
Your doctor repeats the same test or orders a different one, such as an A1C after a high fasting result.
Make a plan
Normal on retest: keep up your checkups. Prediabetes or diabetes: agree on next steps and the date of your next test.
Sugar Defender: from $49 a bottle60 mL · 1 mL a day · 2, 3 or 6 bottles · free US shipping on 3 or 6 · 60-day guarantee
See packsHome meters06
Can a home meter reading diagnose you from your blood sugar numbers?
No, a home meter cannot diagnose you from your blood sugar numbers. Diagnosis uses lab tests and a repeat result (NIDDK, Diabetes & Prediabetes Tests).
A meter shows one finger-stick moment, which helps track a care plan your doctor has set.
If you already have diabetes, a meter also helps you spot a low, often under 70 mg/dL (NIDDK, Low Blood Glucose).
- Log the time, the number and what you ate or did before it
- Bring the log to visits instead of reading one number alone
- Check right away if you feel shaky, sweaty or confused
- Ask your doctor which targets apply to you
Urgent numbers07
Which blood sugar numbers are dangerous?
Low blood sugar numbers are the most urgent: for many people with diabetes, under 70 mg/dL is a low that needs fast sugar right away (NIDDK, Low Blood Glucose).
Severe lows can cause seizures or passing out. That is a 911 call.
A result in the diabetes range is not a 911 call by itself, but it is a reason to see your doctor soon.
Take 15-20 g of fast carbohydrate, such as juice or glucose tablets. Recheck in 15 minutes (NIDDK, Low Blood Glucose). If someone passes out, has a seizure or cannot safely swallow, call 911. The supplements and diabetes medicines guide shows the full list of signs.
Supplements08
Can Sugar Defender change your blood sugar numbers?
No one has shown that Sugar Defender changes blood sugar numbers, because no trial of the drops has been published.
The best ingredient result we found was ginseng, with fasting glucose about 5.6 mg/dL lower across 16 trials and no A1C change (Shishtar et al., PLoS One 2014).
In the drops, ginseng is 12th of 22 blend lines, so at most about 17 mg per mL.
Retest on the schedule your doctor sets, whether or not you try a supplement. If your numbers change, the cause could be food, weight, activity, sleep or medicine, and only a doctor can sort that out. See the Panax ginseng page for the dose math.
Keep taking prescribed medicine exactly as written. A supplement is never a reason to skip or cut a dose.
FAQ09
What do people ask about blood sugar numbers?
People most often ask: What is a normal A1C? The short answer, and 5 more, open below.
Each answer starts with the direct reply, then the reason, with a source where one exists.
What is a normal A1C?
A normal A1C is below 5.7%, per NIDDK (NIDDK, Diabetes & Prediabetes Tests). From 5.7% to 6.4% counts as prediabetes, and 6.5% or higher is in the diabetes range. Your doctor reads it with a second test before making any diagnosis.
What fasting blood sugar is prediabetes?
A fasting plasma glucose of 100 to 125 mg/dL is prediabetes (NIDDK, Diabetes & Prediabetes Tests). Below 100 is normal, and 126 or higher is the diabetes range. One result in that band is usually checked again with a repeat test or an A1C.
What are early signs of diabetes?
Early signs include peeing often, strong thirst and hunger, weight loss without trying, tiredness and blurry vision, per the CDC (CDC, Symptoms of Diabetes). Slow-healing sores and tingling feet can appear too. Many people have no signs at all, which is why testing matters.
How often should I check my blood sugar?
That depends on your results and any medicine you take, so your doctor sets the schedule. A diagnosis needs a lab test and a repeat result (NIDDK, Diabetes & Prediabetes Tests). If you take insulin or a sulfonylurea, ask when to check for lows (NIDDK, Low Blood Glucose). Ask for a written plan.
Is a home meter reading a diagnosis?
No, a home meter reading is not a diagnosis. Diabetes is diagnosed with lab tests such as the A1C or fasting plasma glucose, and a high result needs confirming (NIDDK, Diabetes & Prediabetes Tests). A meter is a tracking tool for a plan your doctor has set.
What blood sugar level is dangerous?
For many people with diabetes, a level under 70 mg/dL is a low that needs fast treatment (NIDDK, Low Blood Glucose). A severe low with seizures or fainting needs 911. Results in the diabetes range are not an emergency by themselves but need a prompt doctor visit.
Who wrote this10
Who wrote and reviewed this Sugar Defender guide?
The Sugar Defender label desk wrote it from the label, the sales page and linked public sources.
A medical reviewer's name goes in the box below once a review is on file.
Pages built from the label, the sales page and linked NIH, FDA, CDC, FTC and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by a U.S. authorized Sugar Defender merchant, not by the manufacturer or the label distributor. We are paid when you buy through our order links.
Keep reading
What should you read next about Sugar Defender?
Read who it's for, side effects, what to expect next: they pick up where this one stops.
Each one starts from the same label and links its sources.
U.S. authorized Sugar Defender merchant
Ready to try Sugar Defender?
Check your medicines first, then choose a pack. Three or six bottles ship free in the US and cost less per bottle, and the 60-day money-back window starts on the day you buy.
- Secure checkout on the sales page
- 60-day money-back guarantee
- Ships from the U.S.; free on 3 or 6
