# Does opening a vial of blood and pouring it into another ruin the quality of the sample?

**URL:** <https://boards.straightdope.com/t/does-opening-a-vial-of-blood-and-pouring-it-into-another-ruin-the-quality-of-the-sample/1004859>\
**Category:** Factual Questions\
**Created:** [July 27, 2024, 5:57pm UTC](https://boards.straightdope.com/t/does-opening-a-vial-of-blood-and-pouring-it-into-another-ruin-the-quality-of-the-sample/1004859 "2024-07-27T17:57:40Z")\
**Posts on this page:** 2\
**Page:** 2

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**Author:** ![Velocity](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/velocity/32/18006_2.png) [@Velocity](https://boards.straightdope.com/u/Velocity)\
**Post date:** [August 3, 2024, 4:21pm UTC](https://boards.straightdope.com/t/does-opening-a-vial-of-blood-and-pouring-it-into-another-ruin-the-quality-of-the-sample/1004859/21 "2024-08-03T16:21:17Z")

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> [@puzzlegal](#):
>
> The OP seems to have described an ordinary venous blood draw, and it’s very unlikely that exposure to the air was relevant.

It was blood drawn from the left arm vein (the most common such draw location.) The phlebotomist was supposed to draw 8 vials of blood but couldn’t even get to 6 because of my slow bleeding.

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**Author:** ![puzzlegal](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/puzzlegal/32/3827_2.png) [@puzzlegal](https://boards.straightdope.com/u/puzzlegal)\
**Post date:** [August 3, 2024, 5:46pm UTC](https://boards.straightdope.com/t/does-opening-a-vial-of-blood-and-pouring-it-into-another-ruin-the-quality-of-the-sample/1004859/22 "2024-08-03T17:46:37Z")

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Huh. I’ve had issues with my blood flow stopping when it’s not a clean stick, but they can usually get it started again. Sometimes i have to intentionally relax my arm for that to happen. I’ve never had anyone give up early.

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