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General Fasting Information

Patient Instructions

Your doctor has requested that a fasting blood test be performed. Fasting is generally overnight.
To ensure accurate results:
  • Do not eat or drink for 10-12 hours prior to your blood test.
  • If you are thirsty, sips of plain water only are permitted. (No coffee, tea, fruit juice, lemonade or alcohol).
  • Medications should only be stopped on the instructions of your doctor. Take them with sips of fluid only.


Download Instructions


12 hours is the optimal fasting period, but 10-14 hours is acceptable. Fasting beyond 14 hours affects the quality of the result.