ATI TEAS (Test of Essential Academic Skills) Version 7MathematicsEasy
A nurse needs to administer 250 mg of a medication. The medication is available in a solution concentration of 125 mg per 5 mL. How many milliliters (mL) should the nurse administer?
- A5 mL
- B10 mL
- C20 mL
- D15 mL
Show answer & explanationAnswer & explanation
Correct answer: B. 10 mL
To find the volume to administer, set up a proportion or use dimensional analysis. (250 mg / 1) * (5 mL / 125 mg) = 10 mL.
Why the other options are wrong
- A. This would be the volume for 125 mg of the medication.
- C. This is incorrect; it would be 500 mg of medication.
- D. This is incorrect; it would be 375 mg of medication.
Dosage Calculation
The process of determining the correct amount of medication to administer based on the prescribed dose and the available concentration.
- Often uses ratio and proportion or dimensional analysis.
- Ensures patient safety by preventing over- or under-dosing.
- Requires careful attention to units of measurement.
Memory trick: Dosage formulas ensure patient safety, always double-check.