Prepare for your next blood draw with practical tips on following lab instructions, staying hydrated, and sharing important information with your phlebotomist.
Follow your specific lab instructions
Not every blood test requires fasting. Ask your healthcare provider or laboratory whether you need to fast and for how long. Follow the instructions for your particular tests.
Drink water as allowed
Plain water is generally allowed during fasting for blood tests and can make collecting the sample easier. Follow any fluid restrictions or special instructions your healthcare provider has given you.
Ask about medicines and supplements
Tell your healthcare provider about your prescription medicines, over-the-counter medicines, vitamins, and supplements. Ask whether you should take them before your test. Do not stop or change medicines on your own.
Tell your phlebotomist what you need
Before the blood draw, mention any previous fainting, difficult blood draws, or concerns about needles. Sharing this information helps the team plan for your comfort.
Speak up if preparation did not go as planned
If you ate or drank something during a required fast, tell the laboratory before your blood draw. They can advise whether the test should proceed or be rescheduled.
This article provides general education. Your healthcare provider’s and laboratory’s instructions take priority.