Fasting Blood Glucose Test - PERLA Health

Fasting Blood Glucose Test

The Fasting Blood Glucose test, which is also called Fasting Blood Sugar (FBS) test, is a blood test that measures blood sugar levels. If you have elevated levels, it shows that your body cannot properly handle sugar, which can be a sign of diabetes and insulin resistance. For this test, you will be required to fast (not eat or drink) for 8 to 12 hours beforehand, following the guidance you got from your healthcare provider. A blood sample will be taken and sent to the lab, where the glucose levels are analyzed. A fasting glucose level of less than 100mg/dL is considered normal, a measurement between 110 – 125 mg/dL is a sign for impaired fasting glucose (for example because of pre-diabetes), and a value greater than 126 mg/dL in two or more sample is considered a sign of diabetes. Follow the instructions of your healthcare provider before, during and after the test.


  1. Mayo Clinic. Diabetes. (accessed 3. August 2020)
  2. Cleveland Clinic. Blood Sugar Tests. (accessed 3. August 2020)
  3. WebMD. Diabetes Testing. (accessed 3. August 2020)

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