If a person weighs 68 lbs, what is their weight in kilograms according to the conversion 1 lb = 2.2 kg, and how much fluid (in ml) should be administered if the dosage is 20 ml per kg?
A) 30.9 kg, 618 ml
B) 149.6 kg, 2992 ml
C) 68 kg, 1360 ml
D) 31.3 kg, 626 ml
The Correct Answer and Explanation is :
The correct answer is: A) 30.9 kg, 618 ml
To convert a person’s weight from pounds to kilograms using the conversion factor 1 lb = 2.2 kg, we can use the formula:
[
\text{Weight in kg} = \frac{\text{Weight in lbs}}{2.2}
]
Given that the person weighs 68 lbs:
[
\text{Weight in kg} = \frac{68}{2.2} \approx 30.9 \text{ kg}
]
Next, we need to calculate the fluid dosage based on a recommended dosage of 20 ml per kg. The formula for calculating the fluid to be administered is:
[
\text{Fluid in ml} = \text{Weight in kg} \times \text{Dosage (ml per kg)}
]
Substituting in the weight we calculated:
[
\text{Fluid in ml} = 30.9 \text{ kg} \times 20 \text{ ml/kg} = 618 \text{ ml}
]
Thus, we find that the weight of the person is approximately 30.9 kg, and the fluid to be administered is 618 ml.
From the options provided, the correct answer is A) 30.9 kg, 618 ml.
Explanation:
- Conversion from pounds to kilograms: This conversion is important in healthcare settings as medications and dosages are often prescribed in metric units. The conversion factor (1 lb = 2.2 kg) simplifies this process. The division gives a more accurate weight in kg, which is crucial for calculating medication dosages.
- Dosage calculation: The fluid dosage is calculated based on the patient’s weight in kg and the specific dosage recommendation. In this case, 20 ml per kg is a common way to determine how much fluid a patient needs, especially in situations involving medication administration or fluid replacement.
- Final values: By following these calculations, we ensure that the patient receives the appropriate amount of fluid based on their weight, which is essential for effective and safe treatment in healthcare practice. This example illustrates the importance of accurate weight conversion and dosage calculations in patient care.