A patient's medication order requires administration of 250 micrograms of the prescribed drug. The available stock solution contains 0.5 milligrams per milliliter. How many milliliters of the solution should be administered to the patient?
0.5 milliliters
0.25 milliliters
1 milliliter
2 milliliters
To determine the correct volume to administer, one must first convert micrograms to milligrams, since the stock solution is measured in milligrams. There are 1,000 micrograms in a milligram. Therefore, 250 micrograms is equivalent to 0.25 milligrams (250 ÷ 1,000 = 0.25). The stock solution has 0.5 milligrams in each milliliter, so to administer 0.25 milligrams, the volume needed is 0.5 milliliters (0.25 mg ÷ 0.5 mg per ml = 0.5 ml). This conversion is critical to ensure the patient receives the correct dose.
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