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vial-blood-sample
![A close-up of a health care provider's hand holding a vial with a blood sample A close-up of a health care provider's hand holding a vial with a blood sample](https://www.nih.gov/sites/default/files/health-info/vial-blood-sample.jpg)
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A close-up of a health care provider's hand holding a vial with a blood sample
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A close-up of a health care provider's hand holding a vial with a blood sample
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A close-up of a health care provider's hand holding a vial with a blood sample