Multiple choice

The rate at which red cells settle down is called ____________.

  1. MCV

  2. PCV

  3. ESR

  4. MCH

  5. Colour index
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C Correct answer
Explanation

Erythrocyte sedimentation rate is the rate at which red blood cells settle down. It is the measure of supernatant plasma separated out at the end of 1 hr when a column of blood mixed with an anticoagulant is kept undisturbed. ESR is increased in pregnancy and during menstruation, and also in infections like tuberculosis, rheumatoid arthritis, malignancy and anemia. ESR decreases in polycythemia and sickle cell anemia.

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