To deliver 1500 mcg using a preparation of 1000 mcg/mL, what volume in milliliters should be drawn?

To deliver 1500 mcg using a preparation of 1000 mcg/mL, what volume in milliliters should be drawn?

• A. 0.75 ml
• B. 1.25 ml
• C. 1.50 ml
• D. 2.0 ml

Answer: (C)

To determine how much volume to draw, use volume = dose ÷ concentration. You want 1500 mcg, and the preparation provides 1000 mcg per mL. So the volume needed is 1500 ÷ 1000 = 1.5 mL. That means 1.5 mL of the solution delivers 1500 mcg. For context, 1000 mcg/mL is the same as 1 mg/mL, and 1500 mcg is 1.5 mg, so 1.5 mL contains the required 1.5 mg. Drawing less or more would yield less or more than the target dose: 0.75 mL gives 750 mcg, 1.25 mL gives 1250 mcg, and 2.0 mL gives 2000 mcg.

To determine how much volume to draw, use volume = dose ÷ concentration. You want 1500 mcg, and the preparation provides 1000 mcg per mL. So the volume needed is 1500 ÷ 1000 = 1.5 mL. That means 1.5 mL of the solution delivers 1500 mcg. For context, 1000 mcg/mL is the same as 1 mg/mL, and 1500 mcg is 1.5 mg, so 1.5 mL contains the required 1.5 mg. Drawing less or more would yield less or more than the target dose: 0.75 mL gives 750 mcg, 1.25 mL gives 1250 mcg, and 2.0 mL gives 2000 mcg.