Which centrifugation condition is commonly used to separate serum?

Which centrifugation condition is commonly used to separate serum?

• A. 10000 rpm for 10 minutes
• B. 2500 rpm for 10 minutes
• C. 4500 rpm for 30 minutes
• D. 8500 rpm for 30 minutes

Answer: (B)

Separating serum relies on density differences: after blood is allowed to clot, the serum is the liquid above the clot and cells. Spinning the sample at a moderate centrifugal force helps push the heavier cells and clot to the bottom while the clear serum remains on top. A typical, practical condition is about 2500 rpm for 10 minutes, which provides efficient separation without applying excessive force that could damage cells or cause hemolysis. Higher speeds (like 10000 rpm or 8500 rpm) or longer spins (such as 30 minutes at 4500 rpm) increase stress on the sample and aren’t needed for routine serum separation.

Separating serum relies on density differences: after blood is allowed to clot, the serum is the liquid above the clot and cells. Spinning the sample at a moderate centrifugal force helps push the heavier cells and clot to the bottom while the clear serum remains on top. A typical, practical condition is about 2500 rpm for 10 minutes, which provides efficient separation without applying excessive force that could damage cells or cause hemolysis. Higher speeds (like 10000 rpm or 8500 rpm) or longer spins (such as 30 minutes at 4500 rpm) increase stress on the sample and aren’t needed for routine serum separation.