What does a clotted taster of blood contained by a vial look similar to?

After extraction, the blood is transferred to vials without anti-coagulants and left to clot. After 30 min, what would it look like?
Answers:
The cell will have started to clot together, forming a lump at the bottom of the tube. The serum will separate and form a layer above the solid mass, clear and yellow within color. Source(s): I'm a physician.

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