Moderate

To preserve blood for transfusion later______________?

Correct answer: B. Add solution of sodium citrate

  • A. Dilute with equal volume of 0.9% saline
  • B. Add solution of sodium citrate
  • C. Add solution of calcium chloride
  • D. Add fibrinogen

Explanation

Sodium citrate preserves stored blood by binding ionised calcium, which is necessary for coagulation. Removing available calcium prevents clot formation without damaging the blood cells at appropriate concentrations.

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