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Diabetes

Adjusting Your Diabetes Medicine and Diet for a Fasting Blood Test

​Be sure to bring a source of fast-acting sugar and your blood glucose meter with you.

To prevent low blood sugars:
  • Have the lab test done as early in the morning as possible.
  • Take your diabetes medicine (pills, injectables, insulin, or insulin by pump) as usual the day before the test or as your healthcare provider tells you.
  • Test your blood sugar before leaving home. If your blood sugar is less than 4 mmol/L, treat, eat a meal, and have the blood test done on another day.
  • Test your blood sugar at the lab. If your blood sugar is low, please tell the person doing your blood work.
  • Test your blood sugar before you leave the lab. Make sure it’s above 4 mmol/L before you drive. If it’s below 4 mmol/L, treat with 15 grams carbohydrate until your blood sugar is over 4 mmol/L.Wait​ 45 minutes before you drive.
  • Take your usual morning diabetes medicine after the test is done and you’re ready to eat.

Current as of: May 3, 2016

Author: Endocrinology and Metabolism Program, Alberta Health Services