A powdered medication label instructs to add 5 mL of diluent to achieve a concentration of 50 mg/mL. If the prescribed dose is 125 mg, how many milliliters should be administered?
2.0 mL
3.0 mL
1.5 mL
2.5 mL
The Correct Answer is D
Calculation:
- Available Concentration: 50 mg/mL
Ordered Dose: 125 mg
- Calculate the volume to administer
Volume to administer = Ordered Dose ÷ Concentration
Volume to administer = 125 ÷ 50
Volume to administer = 2.5 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. 18 gauge, 1 1/2 inch: An 18-gauge needle is very large and long, typically used for rapid fluid administration or blood transfusions. Using this size for an intradermal injection would cause significant tissue trauma and pain.
B. 21 gauge, 1 inch: A 21-gauge, 1-inch needle is commonly used for intramuscular injections. It is too thick and too long for placement within the dermal layer, increasing the risk of incorrect administration.
C. 26–27 gauge, 1/2 inch: Intradermal injections require a very fine, short needle to deposit medication just beneath the epidermis. A 26–27 gauge needle with a 1/2-inch length allows precise placement and minimizes tissue damage.
D. 23–25 gauge, 5/8 inch: This needle size is more appropriate for subcutaneous injections. It is longer and thicker than needed for intradermal administration and may penetrate too deeply into subcutaneous tissue.
Correct Answer is B
Explanation
Calculation:
Ordered Dose: 60 mg
Available Tablet Strength: 30 mg/tablet
- Calculate the number of tablets
Number of Tablets = Dose ÷ Tablet Strength
Number of Tablets = 60 ÷ 30
Number of Tablets = 2 tablets
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