A patient is prescribed Ondansetron 2 mg IV stat. The medication is available as Ondansetron 4 mg/2 mL. How many milliliters should the nurse administer?
2 mL
3 mL
1mL
0.5 mL
The Correct Answer is C
Calculation:
- Identify the ordered dose and available concentration
Ordered Dose: 2 mg
Available Concentration: 4 mg/2 mL
- Calculate the volume to administer
Volume to administer = (Ordered Dose ÷ Available Dose) × Volume of Concentration
Volume to administer = (2 ÷ 4) × 2
Volume to administer = 0.5 × 2
= 1 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. The concentration in the patient's blood or serum through the use of lab tests: Measuring drug concentration in the blood provides information about therapeutic levels but does not define half-life. Lab monitoring helps guide dosing but is separate from the pharmacokinetic concept of half-life.
B. The biotransformation as it accumulates in the body: Biotransformation refers to the metabolism of a drug, usually in the liver, into active or inactive forms. Accumulation can occur with repeated dosing, but this is not the definition of half-life.
C. The tolerance level when a drug is used frequently: Tolerance develops when repeated drug exposure reduces its effect, requiring higher doses for the same response. Tolerance is a pharmacodynamic phenomenon, not related to half-life.
D. The time it takes for the amount of a drug's active substance in your body to reduce by half: Half-life is a pharmacokinetic measure that reflects how quickly a drug is eliminated from the body. It guides dosing intervals, helps predict steady-state concentrations, and determines the duration of action.
Correct Answer is A
Explanation
A. Right: When converting from a larger unit to a smaller unit (e.g., grams to milligrams), the decimal point moves to the right because smaller units are more numerous per one larger unit. This increases the numeric value appropriately for the smaller unit.
B. Left: Moving the decimal to the left converts from smaller units to larger units, which decreases the numeric value. This is the opposite of what is needed when going from larger to smaller units.
C. Middle: “Middle” is not a recognized direction in decimal movement for unit conversions. Conversion is based on powers of ten, not arbitrary placement.
D. Top: “Top” is not a valid term for decimal movement in metric conversions. Unit conversions require moving the decimal point either left or right according to size differences.
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