Reading Your Blood Sugar Numbers
Numbers without context cause more anxiety than they resolve. Here is what each test measures and what it does not.
If you have started paying attention to blood sugar, you will have run into several different measurements that are quoted interchangeably and mean quite different things. Sorting them out makes the whole subject considerably less stressful.
General information, not a diagnosis
The ranges below are the widely published general ones. Your doctor may use different targets for you depending on your age, other conditions and medication. Nothing here replaces having your own results interpreted by someone who knows your history.
Fasting glucose
A blood sample taken after at least eight hours without food. It shows what your body maintains as a baseline when nothing is being digested.
| Range | Usually described as |
|---|---|
| Below 100 mg/dL (5.6 mmol/L) | Normal |
| 100–125 mg/dL (5.6–6.9 mmol/L) | Prediabetes range |
| 126 mg/dL (7.0 mmol/L) or above | Diabetes range, on two separate tests |
Its weakness is that it is one moment. Stress, illness, poor sleep the night before and even the blood draw itself can nudge it.
HbA1c
The most useful single number for most people. Glucose attaches to haemoglobin in your red blood cells, and because those cells live around three months, the percentage that is glycated reflects your average glucose over roughly that period.
Commonly published ranges put below 5.7% as normal, 5.7–6.4% as the prediabetes range, and 6.5% or above as the diabetes range on two tests.
Its advantage is that a bad night or a stressful morning cannot move it. Its limitation is that it is an average: someone with wild swings and someone with steady readings can produce the same figure. Conditions affecting red blood cell lifespan, including some anaemias, can also distort it.
Post-meal readings
Taken one or two hours after eating, this shows how your body handles an actual glucose load. Under 140 mg/dL (7.8 mmol/L) two hours after a meal is the commonly cited normal figure.
This is often where change appears first. Someone with early insulin resistance can have a perfectly normal fasting glucose and a noticeably prolonged post-meal rise, because the compensation system is holding the baseline while struggling with the load.
Using a home meter without driving yourself mad
A single reading means very little. Glucose moves constantly. One number is a snapshot, not a verdict, and a high reading after a particular meal is information rather than failure.
Test in pairs to learn something. Before a meal and two hours after tells you how you handled that meal. Random single readings mostly generate anxiety.
Meters have a margin of error. Home meters are permitted a tolerance against laboratory values. A jump from 105 to 112 may be measurement noise rather than anything real.
Look at patterns over weeks. Day-to-day variation is normal. The trend is the signal.
What to do with a result you do not like
Take it to a doctor rather than to a search engine. A single elevated reading needs confirming before it means anything, and diagnosis rests on repeat testing rather than one number.
And if you have started a supplement, tell whoever is interpreting your results. Several ingredients common in this category can affect glucose, and a clinician trying to make sense of a change needs to know what you are taking.
Questions people ask
Commonly published ranges put below 100 mg/dL (5.6 mmol/L) as normal, 100 to 125 as the prediabetes range, and 126 or above as the diabetes range on two separate tests. Your doctor may use different targets for you.
It is more stable, because it reflects roughly three months of average glucose rather than one moment. It is an average though, so it can hide large swings, and some conditions affecting red blood cells distort it.
Home meters carry a permitted margin of error, and technique, hand washing and blood flow all affect the result. Small differences are usually measurement noise.
If you have a diagnosis, follow your care team's guidance. If you do not, discuss it with a doctor first, since unstructured testing tends to produce anxiety rather than insight.
Considering a supplement?
Read the ingredient pages first, especially if you take medication.
Before you start
This is a dietary supplement, not a medicine, and it is not a treatment for diabetes or prediabetes. Do not use it if you are pregnant or breastfeeding, and do not give it to anyone under 18. If you take any prescription medication — especially anything that lowers blood glucose — talk to your doctor first. Full detail on the safety page.
Ready to try it
Check Today's Availability
Stock and pricing are managed by the official seller. The link below goes straight to their checkout, where the current offer and the 60-day guarantee terms are shown.
