NREMT Paramedic Cognitive ExamOperationsEasy
A paramedic is preparing to administer 10 mg of Ondansetron (Zofran) intravenously to an adult patient experiencing severe nausea and vomiting. The medication is supplied in a prefilled syringe containing 4 mg/2 mL. How many milliliters should the paramedic administer?
- A4 mL
- B2 mL
- C5 mL
- D2.5 mL
Show answer & explanationAnswer & explanation
Correct answer: C. 5 mL
To calculate the volume, use the formula: (Desired Dose / Concentration) = Volume. Desired Dose = 10 mg. Concentration = 4 mg/2 mL. So, (10 mg / 4 mg) * 2 mL = 2.5 * 2 mL = 5 mL.
Why the other options are wrong
- A. Incorrect calculation: this would be 8mg.
- B. Incorrect calculation: this would be 4mg/2mL, or 2mg/mL, so 2mL would be 4mg.
- D. Incorrect calculation: this would be 2.5mg if calculating 10mg / 4mg/mL directly.
Medication Dosage Calculation
The process of determining the correct volume or amount of medication to administer based on the desired dose and the concentration of the available drug.
- Formula: (Desired Dose / Concentration on Hand) * Volume on Hand = Volume to Administer.
- Ensure units are consistent (e.g., mg to mg).
- Double-check calculations to prevent medication errors.
Memory trick: Desired Over Have, Times Volume You'll Give.