Which centrifuge is used specifically for PCV and total protein of blood?

• A. Angle head centrifuge
• B. Swing out centrifuge
• C. Ultracentrifuge
• D. Micro-haematocrit centrifuge

Answer: (D)

This question centers on the instrument best suited for handling very small blood samples in capillary tubes to separate components quickly. A micro-haematocrit centrifuge is designed specifically for these tiny capillary tubes used to measure PCV and to obtain plasma for total protein testing. Its rotor is sized for microhematocrit tubes and it spins at speeds that rapidly separate the packed red cells from the plasma, giving a clear column for PCV reading and a small plasma layer for protein measurement.

Other centrifuges are built for larger tubes or different purposes: angle head and swing-out units handle standard blood collection tubes and larger volumes, while an ultracentrifuge is focused on extremely high speeds for specialized separations not needed for routine PCV or plasma protein tests.