A blood sugar (glucose) test measures how much sugar is in your blood, and a normal fasting blood sugar level is below 100 mg/dL (5.6 mmol/L). It is one of the most common tests in Pakistan and the main way diabetes is caught. There are three ways to measure it: a fasting test (after 8–12 hours with no food), a random test (any time of day), and an OGTT (an oral glucose tolerance test that checks how your body handles a sugar drink). This guide explains each one, the normal ranges, and what a high or low result actually means — in plain language.
This matters deeply in Pakistan: the country has the 3rd highest number of diabetes patients globally — approximately 33 million adults according to the International Diabetes Federation's 2021 Diabetes Atlas. Many people have high blood sugar for years without knowing, because early diabetes often has no obvious symptoms.
How Blood Sugar Is Tested
The same drop of blood can tell very different stories depending on when it is taken. That's why there are three standard tests:
- Fasting Blood Sugar (FBS / FBG) — taken after 8–12 hours with no food or drink except water, usually first thing in the morning. It shows your baseline sugar when the body has had nothing to process, so it's the clearest screening test.
- Random Blood Sugar (RBS) — taken at any time, regardless of when you last ate. Convenient, but the result depends heavily on your last meal, so it is used more as a quick check than a firm diagnosis.
- OGTT (Oral Glucose Tolerance Test) — you drink a standard 75g glucose solution and your blood sugar is checked 2 hours later. It shows how well your body clears a sugar load and is often used to diagnose gestational (pregnancy) diabetes.
A related test, HbA1c, shows your 3-month average sugar instead of a single moment — more on that below.
Blood Sugar Normal Range Chart
Here are the standard ranges for all three tests. Find your test on the left, then read across to see where your number falls:
| Test | Normal | Prediabetes | Diabetes |
|---|---|---|---|
| Fasting (FBS) | Below 100 mg/dL | 100–125 mg/dL | 126 mg/dL or higher |
| Random (RBS) | Below 140 mg/dL | 140–199 mg/dL (borderline) | 200 mg/dL or higher (with symptoms) |
| OGTT (2-hour) | Below 140 mg/dL | 140–199 mg/dL | 200 mg/dL or higher |
mg/dL to mmol/L: Quick Conversion
To convert blood sugar from mg/dL to mmol/L, divide the mg/dL value by 18. Pakistani labs usually report in mg/dL, while some newer and international labs use mmol/L. This table converts the key thresholds so you can match your report either way:
| mg/dL | mmol/L | What It Marks |
|---|---|---|
| 70 mg/dL | 3.9 mmol/L | Low blood sugar cut-off |
| 100 mg/dL | 5.6 mmol/L | Top of normal fasting |
| 126 mg/dL | 7.0 mmol/L | Fasting diabetes threshold |
| 140 mg/dL | 7.8 mmol/L | Top of normal (random / OGTT) |
| 200 mg/dL | 11.1 mmol/L | Diabetes threshold (random / OGTT) |
What High Blood Sugar Means
High blood sugar (hyperglycemia) means there is too much glucose in your blood, usually because the body is not making enough insulin or is not using it properly. On a fasting test, a reading of 100–125 mg/dL is prediabetes and 126 mg/dL (7.0 mmol/L) or higher is diabetes (confirmed on a repeat). On a random test, 200 mg/dL (11.1 mmol/L) or higher with symptoms points to diabetes.
Common symptoms of high blood sugar include:
- Excessive thirst and a dry mouth
- Frequent urination, especially at night
- Tiredness and low energy
- Blurred vision
- Slow-healing wounds and frequent infections
Prediabetes is a warning stage, not a life sentence — for many people it can be reversed with lifestyle changes. Reducing sugar in chai, cutting white rice and roti portions, and walking after meals all help lower post-meal spikes.
What Low Blood Sugar (Hypoglycemia) Means
Blood sugar below 70 mg/dL (3.9 mmol/L) is considered low (hypoglycemia). It happens most often in people who take diabetes medication or insulin, but can also follow a long gap without food, heavy exertion, or fasting. The warning signs come on quickly:
- Shakiness or trembling
- Sweating
- Dizziness or light-headedness
- Confusion or difficulty concentrating
- Sudden hunger
Blood Sugar vs HbA1c
A blood sugar test is a snapshot — it tells you your glucose at one moment in time, which rises and falls through the day around meals. HbA1c is the bigger picture: it reflects your average blood sugar over the past 2–3 months and does not require fasting.
The two work together. A fasting or random test is quick and cheap for a first check, while HbA1c confirms the overall trend and is the standard for monitoring diabetes over time. If your fasting sugar is borderline, a doctor will often add an HbA1c to see whether it's a one-off or a lasting pattern. Learn more in our detailed guide: What is HbA1c? Normal Range and When to Worry.
How Much Does a Blood Sugar Test Cost in Pakistan?
| Test | Approximate Price (2026) |
|---|---|
| Fasting or Random blood sugar | Rs. 150-400 |
| OGTT (75g glucose tolerance test) | Rs. 600-1,200 |
| HbA1c (3-month average) | Rs. 1,000-2,500 |
Fasting and random sugar tests are among the cheapest lab tests available, which makes them an easy first screen. During Ramadan, keep in mind that a fasting test already fits the roza schedule — but tell your doctor if you are fasting, as it affects how results are read.
How Often Should You Test?
- Diagnosed diabetes: as advised by your doctor — often HbA1c every 3 months, with home glucometer checks in between.
- Prediabetes: a fasting sugar or HbA1c at least once a year to catch progression early.
- Healthy adults over 40: a fasting blood sugar once a year as a screening measure, especially with a family history of diabetes.
- Pregnant women: screening for gestational diabetes, usually with an OGTT, as advised during pregnancy.
- Anyone with symptoms (excessive thirst, frequent urination, unexplained weight loss): get tested promptly, regardless of age.
Track Your Blood Sugar Over Time
Upload your lab reports to MedVault and see how your fasting sugar, random sugar, and HbA1c trend across months. AI explains every value and flags when numbers are rising.
Try MedVault Free →Frequently Asked Questions
What is a normal fasting blood sugar level?
A normal fasting blood sugar is below 100 mg/dL (5.6 mmol/L). A reading of 100 to 125 mg/dL (5.6 to 6.9 mmol/L) is prediabetes, and 126 mg/dL (7.0 mmol/L) or higher, confirmed on a repeat test, indicates diabetes. Fasting means 8 to 12 hours with no food or drink except water, so the test is usually done first thing in the morning.
What is a normal random blood sugar level?
A random (non-fasting) blood sugar below 140 mg/dL is normal. Between 140 and 199 mg/dL is borderline and worth following up with a fasting test or HbA1c. A random reading of 200 mg/dL (11.1 mmol/L) or higher, along with symptoms like excessive thirst, frequent urination, or weight loss, suggests diabetes and should be confirmed by a doctor.
What blood sugar level is diabetes?
Diabetes is diagnosed when fasting blood sugar is 126 mg/dL (7.0 mmol/L) or higher, when the 2-hour OGTT value is 200 mg/dL (11.1 mmol/L) or higher, or when a random blood sugar is 200 mg/dL or higher with symptoms. Because a single high reading can have other causes, a diagnosis of diabetes is usually confirmed on a repeat test on a separate day.
What does high blood sugar mean?
High blood sugar (hyperglycemia) means there is too much glucose in your blood, usually because the body is not making enough insulin or not using it well. Fasting readings of 100 to 125 mg/dL signal prediabetes, and 126 mg/dL or higher signals diabetes. Common symptoms include excessive thirst, frequent urination, tiredness, blurred vision, and slow-healing wounds. Diet, weight loss, walking after meals, and medication where needed all help bring it down.
What is a dangerously low blood sugar level?
Blood sugar below 70 mg/dL (3.9 mmol/L) is considered low (hypoglycemia) and causes shakiness, sweating, dizziness, confusion, and hunger. It should be treated quickly with fast-acting sugar such as juice, glucose tablets, or a few dates. A reading below 54 mg/dL is serious and needs urgent attention. Low blood sugar most often happens in people taking diabetes medication or insulin.