Calculate the dosage. Round to the nearest tenth place.
Order: Atropine 1.0 mg IM Stat.
Available: Atropine 0.4 mg/mL
A.
1 ml
B.
1.3 ml
C.
2.5 ml
D.
4 ml
The correct answer and Explanation is :
To determine the correct dosage of atropine to administer, you can follow these steps:
- Identify the Order and Available Dosage:
- Order: Atropine 1.0 mg IM Stat
- Available Concentration: Atropine 0.4 mg/mL
- Calculate the Required Volume:
You need to calculate how many milliliters of the available atropine solution are needed to achieve the ordered dosage of 1.0 mg. Use the formula:
[
\text{Volume (mL)} = \frac{\text{Desired Dose (mg)}}{\text{Concentration (mg/mL)}}
] Substitute the values:
[
\text{Volume (mL)} = \frac{1.0 \text{ mg}}{0.4 \text{ mg/mL}}
] - Perform the Calculation:
[
\text{Volume (mL)} = \frac{1.0}{0.4} = 2.5 \text{ mL}
] - Round to the Nearest Tenth Place:
Since 2.5 is already rounded to the nearest tenth, no further rounding is needed. - Select the Correct Answer:
The correct answer is 2.5 mL, which is option C.
Explanation
The calculation involves finding out how much of the available atropine solution (which has a concentration of 0.4 mg/mL) is needed to provide a dose of 1.0 mg.
By dividing the desired dose (1.0 mg) by the concentration of the solution (0.4 mg/mL), you determine the volume of the solution required to deliver that dose.
In this case:
[
\text{Volume} = \frac{1.0 \text{ mg}}{0.4 \text{ mg/mL}} = 2.5 \text{ mL}
]
Therefore, you need to administer 2.5 mL of the atropine solution to provide the ordered 1.0 mg dose. This ensures that the patient receives the correct amount of medication.