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If 500 ml of normal saline is to be infused in 4 hours, then how many drops need to be infused per minute? The drop factor is 20 mega drops per ml.

If 500 ml of normal saline is to be infused in 4 hours, then how many drops need to be infused per minute? The drop factor is 20 mega drops per ml. Correct Answer 42

Concept:

  • Normal saline:  it is a mixture of NaCl in water.
  • The normal saline solution contains 0.90% sodium chloride, which is similar to the sodium concentration in blood and tears.
  • Saline solution is usually called normal saline, but it’s sometimes referred to as physiological or isotonic saline.

Uses of normal saline:

  • Used for diluting drugs
  • Intravascular resuscitation and replacement of salt loss e.g. diarrhea and vomiting.
  • Also for diluting packed RBCs prior to transfusion.

Explanation:

  • Formula: (ML/hour) × (drop factor/60) = Drops/minutes
  • (500/4) × (20/60) = Drops per minutes
  • ∴, Drops per minute = 41.666 ≈ 42

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