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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 water only.
  • No smoking or chewing gum. 


Do not fast for longer than 16 hours before your blood test is performed. 

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