A physician orders 250 mg of a medication. The available dosage strength is 500 mg per 2 mL. Using the formula method, how much should the nurse administer?
1 mL
0.5 mL
1.5 mL
2 mL
The Correct Answer is A
Calculation using the Formula Method
Desired Dose (D): 250 mg
Dose on Hand (H): 500 mg
Quantity (Q): 2 mL
The formula method is:
Amount to Administer = (Desired (D) / Have (H)) x Quantity (Q)
= (250 mg / 500 mg) x 2 mL
= 0.5 x 2 mL
= 1 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Calculation:
Ordered Dose = 0.5 g
Available Dose = 250 mg
- Convert Ordered Dose to mg
Ordered Dose = 0.5 × 1000 = 500 mg
Number of tablets = Ordered Dose / Available Dose
= 500 / 250
= 2 tablets
Correct Answer is D
Explanation
Rationale:
A. The dilution: Dilution is considered when preparing medications from concentrated solutions, but it is not represented by "H" in the standard formula.
B. The total quantity: The total quantity refers to the amount available for administration in the medication form, often represented by "Q," not "H."
C. The desired outcome: The desired outcome relates to therapeutic goals but is not part of the formula components.
D. The dose on hand: "H" represents the dose on hand, meaning the strength or concentration of the medication available. This value is used to calculate the exact amount to administer to achieve the desired dose safely.
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