You are asked to reconstitute a powdered medication. The vial states to add 4 mL of diluent to yield a concentration of 250 mg/mL. What is the total volume of the reconstituted solution?
5 mL
6 mL
4.5 mL
4 mL
The Correct Answer is A
A. 5 mL: When 4 mL of diluent is added to a powdered medication, the powder itself contributes additional volume once dissolved. The manufacturer’s instruction indicates that adding 4 mL results in a final total volume of 5 mL to achieve the stated concentration of 250 mg/mL.
B. 6 mL: This option assumes a greater volume displacement than indicated by the manufacturer. The final volume after reconstitution is specified on the vial and should not be estimated beyond the provided instructions.
C. 4.5 mL: Although powders do increase volume after reconstitution, the vial clearly states the final concentration achieved after adding 4 mL. This does not align with the labeled final volume.
D. 4 mL: This represents only the amount of diluent added and does not include the volume contributed by the medication powder after reconstitution, making it inaccurate for calculating doses.
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Related Questions
Correct Answer is D
Explanation
A. 1 mL insulin syringe: While a 1 mL syringe can hold up to 100 units of U-100 insulin, using it for a 40-unit dose may reduce precision because the markings are more spread out, making it harder to measure accurately.
B. Tuberculin syringe: Tuberculin syringes are designed for very small volumes, usually in milliliters or fractions thereof, and are not calibrated in insulin units, making them inappropriate for accurate insulin dosing.
C. 0.3 mL insulin syringe: A 0.3 mL insulin syringe is typically used for small doses up to 30 units. Administering 40 units in this syringe would exceed its capacity and compromise safe and accurate dosing.
D. 0.5 mL insulin syringe: A 0.5 mL syringe is designed for doses up to 50 units of U-100 insulin. It allows for precise measurement of a 40-unit dose and reduces the risk of dosing errors, making it the most appropriate choice for safe administration.
Correct Answer is C
Explanation
Calculation:
- Set up the ratio and proportion
Ordered Dose : X = Available Dose : 1 Tablet
200 mg : X = 100 mg : 1
- Solve for X
X = (200 × 1) ÷ 100
X = 200 ÷ 100
X = 2 tablets
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