Ano ang normal na blood sugar? Here are some types of blood sugar tests to diagnose diabetes mellitus.
1. Fasting Blood Sugar (FBS)
Fasting blood sugar is a range of normal blood sugar levels before meals.
This test is also useful for checking whether you are at risk for prediabetes or diabetes.
Before taking a fasting blood sugar test, you are required to fast for 8 hours.
The following are the criteria for normal blood sugar levels from a fasting blood sugar test:
- Normal (no diabetes): below 100 mg/dL
- Prediabetes: 100-125 mg/dL
- Diabetes: 126 mg/dL or more
2. Oral Glucose Tolerance Test (OGTT)
Oral glucose tolerance test (OGTT) aims to diagnose diabetes mellitus or insulin resistance. This test also determines whether the body’s cells have difficulty utilizing glucose.
The doctor will ask you to fast for 8-12 hours. After that, you will drink 75 mL of sugar solution.
In this test, your doctor checks your blood sugar before and after drinking the sugar solution.
Ano ang normal na blood sugar? The following are the criteria for limiting normal blood sugar levels from TTGO results:
- Normal (no diabetes): below 140 mg/dL
- Prediabetes: 140-199 mg/dL
- Diabetes: 200 mg/dL or more
3. Random Blood Sugar (RBS)
A blood sugar test, also known as RBS, can be done at any time of the day.
This test is useful for finding out the range of a person’s blood sugar levels for one day and is not based on a certain time range.
The following are criteria for normal sugar levels from the results shown by the GDS test:
- Normal (no diabetes): below 200 mg/dL
- Diabetes: 200 mg/dL or more
4. HbA1c
The HbA1c test is used to diagnose diabetes because HbA1c describes the average blood sugar level over the last three months.
The criteria for the HbA1c test results are as follows:
- Normal (no diabetes): less than 5.7%
- Prediabetes: 5,7-6,4%
- Diabetes: 6.5% or more

When Should You Check Your Blood Sugar?
People who have never been diagnosed with diabetes are advised to check their blood sugar according to the risk factors they have. If the results are normal, you can repeat the examination at least every three years.
Meanwhile, for those with diabetes, blood sugar checks are carried out periodically to find out whether their diabetes condition is under control.
Your doctor may suggest checking your blood sugar 1-3 months or HbA1c every 3-6 months.
You can also check your blood sugar independently using a portable blood sugar monitor or glucometer. Follow your doctor’s advice regarding how often and when to do this examination.
According to the National Institute of Diabetes, the best times to check blood sugar are in the morning, before eating, two hours after eating, and before bed. However, you can also check your blood sugar if you have symptoms of hypoglycemia.
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