This test is performed to measure the amount of glucose present in the blood. A steady level of glucose should be maintained in the blood as it is the basic source of energy for the body.
When it's done:
- To diagnose diabetes
- To screen for both high blood glucose and low blood glucose levels
- To monitor blood glucose levels in patients with diabetes
- To identify people who are likely to develop diabetes (pre-diabetes)
- To monitor treatment of diabetes
The test is used to detect diabetes (high glucose levels) if someone is showing the following symptoms:
- Increased thirst with frequent urination
- Delayed wound healing
- Blurred vision
This test is also used to detect abnormally low blood sugar levels when the patients have symptoms such as:
When to Avoid:
There is no specific condition when the test should be avoided.
How to prepare:
It is recommended not to eat or drink anything except water for at least 8 hours before the test. This is the fasting blood sugar test and is usually the first test done to check for pre-diabetes and diabetes. In patients with diabetes, glucose levels are checked while fasting and after meals. Your doctor may also ask for a glycosylated haemoglobin test to check the control of your diabetes over the past 2 to 3 months.