A clinician orders a dose of 0.25 g of a medication to be given. The solution concentration is 100 mg per mL. How many milliliters should be administered?

A clinician orders a dose of 0.25 g of a medication to be given. The solution concentration is 100 mg per mL. How many milliliters should be administered?

• A. 1.5 mL
• B. 2.0 mL
• C. 2.5 mL
• D. 3.0 mL

Answer: (C)

To figure out how much to give, use volume = dose ÷ (concentration). First convert the ordered dose to milligrams: 0.25 g × 1000 = 250 mg. Then divide by the concentration: 250 mg ÷ 100 mg/mL = 2.5 mL. A quick check confirms the math: 2.5 mL × 100 mg/mL = 250 mg, which matches the prescribed dose. So the administered volume is 2.5 mL.

To figure out how much to give, use volume = dose ÷ (concentration). First convert the ordered dose to milligrams: 0.25 g × 1000 = 250 mg. Then divide by the concentration: 250 mg ÷ 100 mg/mL = 2.5 mL. A quick check confirms the math: 2.5 mL × 100 mg/mL = 250 mg, which matches the prescribed dose. So the administered volume is 2.5 mL.