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The Pro Thrombin is also called a PT/INR and it is drawn in a light blue sodium citrate tube which is then spun down in a centrifuge to separate the plasma from the red cells and the plasma is used to run the test.

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Wiki User

12y ago
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Wiki User

12y ago

Light blue

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Anonymous

Lvl 1
3y ago

a tube that must be protected from light

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Q: What tube is a protime test drawn in?
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