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With anticoagulant = plasma (still has soluble fibrinogen). Without anticoagulant = serum ( fibrinogen has been converted into insoluble fibrin in clot and is spun down with cells). Source(s): Medical Scientist. liz down under Â· 9 years ago.
A fifteen-minute spin at the same speed is required for spinning tubes in a fixed-angle centrifuge. Serum and plasma tubes without gel can be spun at a speed of 1000 RCF for ten minutes. 4. It is important to spin gel tubes for the recommended time.