How is the formula D/H x Q used in dosage calculations?
To calculate the amount of medication to administer
To determine the frequency of medication administration
To identify potential drug interactions
To assess the drug's efficacy
The Correct Answer is A
Rationale:
A. To calculate the amount of medication to administer: The formula D/H × Q is used to determine the correct dose of a medication based on the desired dose (D), the available dose or strength (H), and the quantity of the dosage form (Q). This ensures accurate dosing, which is especially critical in pediatric or high-risk medications.
B. To determine the frequency of medication administration: The formula does not provide information about how often a medication should be given; frequency is based on the prescribed schedule and pharmacokinetics of the drug.
C. To identify potential drug interactions: Drug interactions are assessed separately through patient history, medication review, and reference resources, and are not calculated using the D/H × Q formula.
D. To assess the drug's efficacy: Efficacy is evaluated through patient response, laboratory results, or symptom improvement, not through dosage calculation formulas.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Calculation:
Ordered Dose = 2 tablespoons
Conversion:1 tablespoon = 15 mL
Volume in mL = Number of tablespoons × 15 mL
= 2 × 15
= 30 mL
Correct Answer is C
Explanation
Rationale:
A. Between 6:00 AM and 10:00 AM: This window is too wide for time-critical medications, which require tighter administration to maintain therapeutic levels and avoid adverse effects.
B. At any time during the morning shift: Administering at any time during the shift does not meet the strict timing requirements for time-critical medications and can compromise effectiveness.
C. Between 7:30 AM and 8:30 AM: Time-critical medications are typically allowed a 30-minute window before or after the scheduled time. Administering within this window ensures the medication maintains therapeutic efficacy while providing a practical margin for nursing workflow.
D. At 8:00 AM exactly: While ideal, strict exact timing is often impractical; the accepted 30-minute window provides flexibility without compromising therapeutic effect.
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