ATI TEAS (Test of Essential Academic Skills) Version 7MathematicsMedium
A patient is prescribed a medication that comes in a solution of 500 mg/10 mL. The physician orders 0.75 grams of the medication. How many milliliters of the solution should the nurse administer?
- A7.5 mL
- B10 mL
- C20 mL
- D15 mL
Show answer & explanationAnswer & explanation
Correct answer: D. 15 mL
First, convert the ordered dose to milligrams: 0.75 grams = 750 mg (since 1 gram = 1000 mg). Then, use the concentration to find the volume: (750 mg / 500 mg) * 10 mL = 1.5 * 10 mL = 15 mL.
Why the other options are wrong
- A. This answer indicates a miscalculation in either unit conversion or proportion, possibly using 0.75 mg directly.
- B. This answer suggests using the full 10 mL without proper dose calculation or conversion.
- C. This answer indicates an error in the ratio or an incorrect multiplication factor.
Dosage Calculation (Liquid)
Determining the correct volume of a liquid medication to administer based on the prescribed dose and available concentration.
- Requires consistent units (e.g., mg or g).
- Formula: (Desired Dose / Available Concentration) * Volume of Available Concentration.
- Always double-check calculations to prevent medication errors.
Memory trick: Desired over Have, Times the Volume you Get.