A medication order is for 45 units. The vial strength is 100 units per mL. How many milliliters should be drawn?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

A medication order is for 45 units. The vial strength is 100 units per mL. How many milliliters should be drawn?

Explanation:
Calculating the required volume from a vial uses volume to draw = ordered units ÷ concentration (units per mL). With 45 units needed and a concentration of 100 units per mL, you divide 45 by 100, giving 0.45 mL. That is the exact amount to draw. If you drew 0.5 mL, you’d administer 50 units; 0.75 mL yields 75 units; 1 mL yields 100 units. So 0.45 mL is the precise volume to achieve 45 units.

Calculating the required volume from a vial uses volume to draw = ordered units ÷ concentration (units per mL). With 45 units needed and a concentration of 100 units per mL, you divide 45 by 100, giving 0.45 mL. That is the exact amount to draw. If you drew 0.5 mL, you’d administer 50 units; 0.75 mL yields 75 units; 1 mL yields 100 units. So 0.45 mL is the precise volume to achieve 45 units.

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