A member asked:

What are reasons why would blood clot during a whole blood donation?

A doctor has provided 1 answer

Rate of flow.: Blood will clot if there was trouble placing the needled in the vein and either damaged tissue (containing tissue factor) is in contact with the blood or blood flow is very slow. The anticoagulant is mainly in the collection bag, so the blood must flow fast enough to reach the bag before it has time to clot.

Answered 6/17/2021

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