Diagnostics
What to Know Before Your Next Blood Test
From preparation to results, understand what to expect before having routine blood work.
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Jerome Bell
September 29,2026
A little preparation can make your blood test easier.
Blood tests are one of the most common ways your provider learns about your health, but the process can feel unfamiliar if you haven't had one recently. Knowing what to expect ahead of time can make the whole experience feel simpler and less stressful.
Do you need to fast?
Some blood tests require fasting for a set number of hours beforehand, while others don't need any preparation at all. Your provider will let you know if fasting applies to your specific test, and for how long. If you're ever unsure, it's best to check with your care team before your appointment rather than guess.
Stay hydrated
Drinking water before your test can make it easier for your provider to draw blood, since well-hydrated veins are simpler to locate. Unless you've been told to fast completely, staying hydrated in the hours before your visit is generally a good idea.
Tell your care team about medications
Certain medications and supplements can affect specific test results. Let your provider know about anything you're currently taking, including over-the-counter medication, so they can account for it when reviewing your results.
Wear comfortable clothing
Choosing a short-sleeved shirt, or a top that rolls up easily, can make the process quicker and more comfortable for you and your provider.
Follow your healthcare provider's instructions
Every test is a little different, so it's worth confirming any specific instructions ahead of your visit. This may include:
Fasting for a set period beforehand
Avoiding certain medications temporarily
Scheduling your test at a particular time of day
Avoiding strenuous exercise before your visit
Bring the information you need
Having a few things ready can help your visit go smoothly:
A form of identification
Your insurance information
A list of current medications
Any referral or order from your provider
What happens during a blood test?
Most blood tests are quick and straightforward. A small sample is drawn, usually from a vein in your arm, and sent to a lab for analysis. Many people feel only brief, minor discomfort during the process.
What should you do afterward?
After your test, it's a good idea to keep the bandage on for a short while and avoid heavy lifting with that arm for the rest of the day. Your provider will let you know when to expect your results and will follow up with you to explain what they mean.
HEALTH & WELLNESS
