The patient is to receive 7.5 mg of a medication PO daily. The pharmacy sends a bottle of scored tablets with the dosage strength of 15 mg per tablet. The nurse sets up a proportion to solve a calculation for this ordered dose. Identify the setup for the unknown ratio.
x mg: 0.5 tablet
7.5 mg: x tablet
x mg: 1 tablet
15 mg: x tablet
The Correct Answer is B
A. x mg: 0.5 tablet: This setup reverses the relationship and would not allow the nurse to calculate the correct number of tablets for the ordered dose.
B. 7.5 mg: x tablet: This correctly sets up a proportion with the desired dose (7.5 mg) on the left and the unknown number of tablets (x) on the right. Using the known tablet strength (15 mg per tablet) allows accurate calculation of the fraction of a tablet to administer.
C. x mg: 1 tablet: This setup incorrectly places the unknown dose as the numerator. It does not align with standard proportion calculations for determining the number of tablets needed.
D. 15 mg: x tablet: This setup represents the known tablet strength but does not pair it with the prescribed dose, so it is incomplete for solving the calculation safely.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Diazepam 5 mg PO every 6 hr as needed anxiety: The dose, route, frequency, and indication are clearly specified. No clarification is needed before administration.
B. Ketorolac 15 mg IM now: The order provides a clear dose, route, and timing for immediate administration, so it does not require clarification.
C. Lactulose 15 mL PO every 12 hr: This order specifies the dose, route, and frequency accurately. The nurse can safely administer as written.
D. Digoxin 1/2 mg PO every a.m.: The order is ambiguous because using a fraction for digoxin dosing can lead to errors. Standard practice is to write the dose in decimal form (0.5 mg), so the nurse should clarify with the prescriber to prevent a potential overdose.
Correct Answer is C
Explanation
A. Captopril 12.5 mg PO at 0700 and 1700: The dose, route, and timing are clearly specified, so no clarification is needed before administration.
B. Ketorolac 15 mg IM stat: The order provides a clear dose, route, and timing for immediate administration, making it safe to give without clarification.
C. Morphine sulfate 45.0 mg PO once a day for pain: The use of a trailing zero (45.0 mg) can lead to dosing errors if the decimal point is misread. Standard practice is to write whole numbers without a trailing zero (45 mg). The nurse should clarify with the prescriber to ensure safe administration.
D. Regular insulin 7 units SUBQ 30 minutes before breakfast: The dose, route, and timing are clearly indicated, so this order does not require clarification.
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