Blood sugar can be tested in several ways, and you may come across terms such as fasting blood sugar, random blood sugar, and HbA1c. All three relate to the level of sugar in the blood, but each gives a slightly different picture.
The Difference Between Fasting, Random, and HbA1c
Here is a general overview of each test:
- Fasting blood sugar is checked after you have not eaten or had anything to drink other than water for several hours, as advised. This test reflects your sugar level while the body is in a fasting state.
- Random blood sugar is checked at any time regardless of when you last ate, so it reflects your sugar level at that moment.
- HbA1c gives a picture of your average blood sugar level over the past few months, not just at the moment the sample is taken.
Why There Are Several Types of Tests
Each test captures a different perspective. Some reflect your condition at a single moment, while others reflect the trend over a longer period. For this reason, doctors sometimes combine several types of tests to get a more complete picture.
Blood sugar levels can also be affected by many things, such as food and drink beforehand, physical activity, stress, lack of sleep, or your condition when you are unwell. The value considered ideal can differ between laboratories and depends on each person's condition.
Preparing for the Test
- Follow the fasting instructions if you are asked to fast before a particular test.
- Let the staff know if you have just eaten or are feeling unwell.
- Keep your previous results so the doctor can see the trend.
This article aims to help you understand the types of blood sugar tests, not to diagnose or replace a medical assessment. If you have questions or concerns about your results, it is best to consult a doctor, including a 20FIT doctor, so you can receive an explanation suited to your condition.