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Preparing for Your Appointment

Last Update 8 maanden geleden

Do I need to fast before my blood draw? How should I prepare for therapeutic phlebotomy? What if I feel faint during a blood draw?

Do I need to fast before my blood draw?

Whether you need to fast depends on the type of test ordered by your provider.


  • Fasting tests (like glucose or lipid panels) usually require no food or drink except water for 8–12 hours before your draw.


  • Non-fasting tests do not require any special preparation.


Always follow your provider’s instructions. If you are unsure, contact your doctor before your appointment.


✅ Tip: Drinking water before your appointment helps make your veins easier to access. Usually it is best to be sufficiently hydrating at least 24 hours before your appointment.