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Blood Testing For Transfusion

  • Español PDF

Your child’s provider has ordered some lab tests to check your child’s blood type. For safety reasons, our hospital’s policy is to test blood samples from 2 different collections to make sure that blood matching your child’s type is available in case it is needed for your child’s care. 

Why does my child need two samples for transfusion?

Your child’s safety is our number one priority. The safest transfusion is one that is provided after 2 samples are tested to be sure the blood type is correct.

Does everyone need two samples for transfusion?

No. Babies less than 4 months of age do not need 2 samples before they have a blood transfusion. Everyone else needs 2 samples.

What if I have questions about the blood testing?

If you still have questions about blood transfusion testing, please ask your child’s healthcare provider or call the Seattle Children’s Transfusion Nurse Consultant at 206-987-5013.

To Learn More

  • Seattle Children's Transfusion Nurse Consultant at
    206-987-5013
  • Ask your child’s healthcare provider
  • seattlechildrens.org/patient-education

Free Interpreter Services

  • In the hospital, ask your nurse.
  • From outside the hospital, call the toll-free Family Interpreting Line, 1-866-583-1527. Tell the interpreter the name or extension you need.
Seattle Children's Hospital

Seattle Children’s offers free interpreter services for patients, family members and legal representatives who are deaf or hard of hearing or speak a language other than English. Seattle Children’s will make this information available in alternate formats upon request. Call the Family Resource Center at 206-987-2201. This handout has been reviewed by clinical staff at Seattle Children’s. However, your needs are unique. Before you act or rely upon this information, please talk with your healthcare provider.

© 2026 Seattle Children’s, Seattle, Washington. All rights reserved.

10/01/2024
PE1712
Patient and Family Education | Transfusion Service

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4800 Sand Point Way NE, Seattle, WA 98105

206-987-2000 866-987-2000 (toll-free) 206-987-0391 (TTY)

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Seattle Children’s complies with applicable federal and other civil rights laws and does not discriminate, exclude people or treat them differently based on race, color, religion (creed), sex, gender identity or expression, sexual orientation, national origin (ancestry), age, disability, or any other status protected by applicable federal, state or local law. Financial assistance for medically necessary services is based on family income and hospital resources and is provided to children under age 21 whose primary residence is in Washington, Alaska, Montana or Idaho.