The haematocrit (packed cell volume) A. May be obtained by centrifuga

1.	The haematocrit (packed cell volume) A. May be obtained by centrifugation of blood. B. May be calculated by multiplying the mean cell volume by the red cell count. C. Rises in a patient who sustains widespread burns. D. Rises following injections of aldosterone. E. Rises in macrocytic megaloblastic anaemias such as pernicious (B12 deficiency) anaemia.
Answer» A. True Since red cells are heavier than plasma. B. True This gives a slightly lower value than centrifugation which traps a little plasma between cells. C. True Due to loss of plasma and interstitial fluid. D. False It falls as extracellular fluid and hence plasma volume increases. E. False Though individual RBCs are large, total red cell mass is decreased.

The haematocrit (packed cell volume) A. May be obtained by centrifugation of blood. B. May be calculated by multiplying the mean cell volume by the red cell count. C. Rises in a patient who sustains widespread burns. D. Rises following injections of aldosterone. E. Rises in macrocytic megaloblastic anaemias such as pernicious (B12 deficiency) anaemia.

Answer»

A. True Since red cells are heavier than plasma.

B. True This gives a slightly lower value than centrifugation which traps a little plasma between cells.

C. True Due to loss of plasma and interstitial fluid.

D. False It falls as extracellular fluid and hence plasma volume increases.

E. False Though individual RBCs are large, total red cell mass is decreased.

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