Fasting Blood Glucose Test

This test measures the blood level of glucose (sugar) after not eating for at least eight hours.

This test measures the blood level of glucose (sugar) after not eating for at least eight hours.

This test checks your blood sugar after not eating for at least 8 hours. It is one of the tests used to screen for diabetes or to make sure your diabetes treatment is working.

In an adult, the blood sample is taken from a vein in the arm. Sometimes it is taken by pricking a finger.

  • You cannot eat for at least 8 hours before the test.
  • Ask your healthcare provider if you should take your morning medications before the test.
  • Do not stop taking any medication unless your healthcare provider tells you to do so.

What should I ask my healthcare provider before having this test?

  • Other than not eating for 8 hours, is there any special preparation for the test? (If so, get clear instructions on what you need to do.)
  • What is the reason for the test? Will the test results change my treatment plan? If not, do I need the test?


Also known as:

Low Blood Sugar
Laboratory Work
High Blood Sugar
Glucose Test
Gestational Diabetes
Fasting Blood Sugar
Fasting Blood Glucose Test
Diabetes Screening
Diabetes Monitoring
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