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Overview:

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
  • Tiredness

This test is also used to detect abnormally low blood sugar levels when the patients have symptoms such as:

  • Sweating
  • Trembling
  • Hunger
  • Confusion

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.

 

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