Your blood gives doctors all kinds of clues about your health. It's normal to be nervous about this test — no one loves needles. But most blood draws take less than a minute. Back to Articles Related Articles Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. © 1995-2021 KidsHealth®. All rights reserved. Images provided by The Nemours Foundation, iStock, Getty Images, Veer, Shutterstock, and Clipart.com.