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Why does blood clot in tubes collected for a CBC, PT, and APTT?

aptt blood CBC clot collected pt tubes
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Why does blood clot in tubes collected for a CBC, PT, and APTT?

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Clotting begins when blood comes in contact with a foreign surface or from tissue activation. There is a very short time window to successfully procure a blood sample and deliver it into a tube with added anticoagulant.

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