Blood Sugar Chart: What Is a Normal Level in mg/dL?
People often ask us the same question in different words: sugar kitni honi chahiye? The honest answer is that the "normal" range depends on when the test was taken and on your own situation. This chart explains the commonly used reference ranges and, more importantly, what to do with your number.
Key takeaways
- For most adults without diabetes, fasting sugar is under 100 mg/dL.
- Fasting 100–125 mg/dL is the pre-diabetes range; 126 or above on two tests suggests diabetes.
- A random reading of 200 mg/dL or more, with symptoms, needs a doctor promptly.
- Glucometer readings run a little differently from laboratory results; both have their place.
- One reading is never a diagnosis. Confirmation and targets come from your doctor.
The reference ranges, in plain words
Laboratories in Pakistan report blood sugar in milligrams per decilitre (mg/dL). The ranges below are the widely used diagnostic reference values for adults who are not pregnant. They are a starting point for a conversation with a doctor, not a self-diagnosis tool.
| When the test is taken | Typical | Pre-diabetes | Diabetes range |
|---|---|---|---|
| Fasting (8+ hours, no food) | Under 100 | 100–125 | 126 or above, twice |
| Random (any time) | Under 140 | 140–199 | 200 or above with symptoms |
| 2 hours after a meal | Under 140 | 140–199 | 200 or above |
| 3-month average (%) | Under 5.7 | 5.7–6.4 | 6.5 or above |
If you already live with diabetes, these are diagnostic ranges, not your targets. A common fasting target is 80–130 mg/dL and under 180 two hours after eating, but your own numbers are agreed with your doctor and may be deliberately gentler.
Is there a chart "by age"?
Many websites publish age-by-age sugar tables. Honestly, the diagnostic ranges above do not change with age. What does change with age is the target your doctor chooses for you: an older person with other conditions may be given a gentler, safer target than a younger person. So the age question has a real answer, but it comes from an individual assessment, not a lookup table.
Testing properly at home
A surprising number of "high" readings are technique, not sugar. The most common cause is unwashed hands: a trace of fruit, biscuit or sweet tea on a fingertip can lift a result substantially. A meter is a good tool when it is used carefully, and a poor one when it is not.
Common mistakes
- Testing without washing hands, or while the finger is still wet.
- Pricking the fingertip pad, which hurts most and bleeds least.
- Using strips past their expiry, or a pot left open.
- Testing "fasting" after tea with sugar, or only 4–5 hours after eating.
- Recording only the alarming readings.
Better practice
- Wash with plain water, dry completely, then prick.
- Use the side of the fingertip, and change fingers each time.
- Check the expiry, keep the pot closed, store away from heat.
- Fasting means 8 hours with water only. Time it honestly.
- Write every reading with its time; the pattern is what a doctor reads.
One more thing that confuses people: a glucometer uses a drop of capillary blood from the finger, while a laboratory measures plasma from a vein. The two are not expected to match exactly, and a modest difference between them is normal rather than a sign that one is broken. Diagnosis is made on the laboratory result.
One high reading: what now?
A single high number does not mean you have diabetes, and a single normal number does not rule it out. Readings move with food, stress, illness, poor sleep and even a rushed glucometer test. What matters is the pattern. If a reading surprises you, repeat it on another day at the proper time, write both numbers down, and take them to a doctor. A laboratory test of your 3-month average (HbA1c) is often the next sensible step.
- An illness, infection or fever can raise sugar for several days.
- Steroids and some other medicines raise it; never stop a prescribed medicine to "fix" a reading.
- A short or broken night pushes morning readings up.
- Stress and pain raise sugar through hormones, without any change in diet.
- The pre-dawn rise before waking is normal physiology, not a mistake you made.
Go to a doctor or emergency department today if a very high reading comes with drowsiness, vomiting, deep or fast breathing, or confusion, or if a low reading (under 70 mg/dL) comes with shakiness, sweating or fainting that does not settle after taking sugar.
Which test should you ask for?
A fasting sugar is the usual first check. If it is borderline, or if readings and symptoms do not match, doctors commonly add the 3-month average test (HbA1c) or a glucose tolerance test. Each answers a different question, so let the doctor choose the combination rather than collecting reports at random.
Bring the printed reports rather than a remembered figure, and where you can, use the same laboratory each time. Methods and reference ranges differ slightly between labs, so a trend measured in one place is easier to trust than three numbers from three places.
Key points
- • Numbers are a conversation starter, not a verdict.
- • Wash and dry hands before a finger-prick; it is the commonest cause of a false high.
- • Repeat surprising readings, record them, and bring the pattern to a doctor.
- • Targets are personal; diagnostic ranges are not an instruction to self-treat.
When to see a doctor
- Fasting readings repeatedly at 100 mg/dL or above, or random readings at 140 or above.
- Any reading of 200 or above, especially with thirst, frequent urination or weight loss.
- Readings that swing widely, or lows under 70 mg/dL.
- You have risk factors (family history, waist gain, high blood pressure) and have never been tested.
Related articles
Understanding HbA1c: Your 3-Month Blood Sugar Picture
What HbA1c means, why it matters for diabetes control, and how to read your result, explained simply for patients in Pakistan.
Common Signs of High Blood Sugar, and When to Act
Everyday signs that blood sugar may be running high, why they happen, and the warning signs that need urgent medical attention.
Pre-Diabetes: The Warning Stage Most People Never Feel
Sugar hone se pehle ki alamat: why pre-diabetes usually has no symptoms, the numbers doctors use, who should get tested, and the genuinely good news from prevention research.