What laboratory technique is used to separate plasma from formed elements in a blood sample?

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Multiple Choice

What laboratory technique is used to separate plasma from formed elements in a blood sample?

Separating plasma from formed elements relies on density differences among blood components. When whole blood is spun in a centrifuge, the heavier formed elements—red cells, white cells, and platelets—collect at the bottom, while the lighter liquid portion remains on top as plasma. This density-driven separation provides a clear plasma layer for analysis of proteins, electrolytes, and other soluble substances. The other techniques listed—spectrophotometry, electrophoresis, and chromatography—are analytical methods for measuring or separating molecules but do not perform the initial separation of plasma from cellular elements in a standard blood sample. Centrifugation is the method that accomplishes this initial separation efficiently.

Separating plasma from formed elements relies on density differences among blood components. When whole blood is spun in a centrifuge, the heavier formed elements—red cells, white cells, and platelets—collect at the bottom, while the lighter liquid portion remains on top as plasma. This density-driven separation provides a clear plasma layer for analysis of proteins, electrolytes, and other soluble substances. The other techniques listed—spectrophotometry, electrophoresis, and chromatography—are analytical methods for measuring or separating molecules but do not perform the initial separation of plasma from cellular elements in a standard blood sample. Centrifugation is the method that accomplishes this initial separation efficiently.

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