Lære Calculating Body Surface Area (BSA) for Dosing | Dosage Calculations and Patient Safety

Calculating the correct medication dose is vital for patient safety, especially when dealing with drugs that have narrow therapeutic windows. One key metric often used for dosing certain medications, such as chemotherapy agents, is Body Surface Area (BSA). BSA provides a more accurate estimate of metabolic mass than body weight alone, making it a preferred method for adjusting doses in specific clinical situations. The Mosteller formula is a widely accepted method for calculating BSA due to its simplicity and reliability. The formula is:

BSA (m²) = sqrt([height (cm) × weight (kg)] / 3600)

Using this formula, you can quickly determine a patient's BSA based on their height and weight, ensuring safer and more effective dosing.


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def calculate_bsa_mosteller(height_cm, weight_kg):
    """
    Calculate Body Surface Area (BSA) using the Mosteller formula.
    Args:
        height_cm (float): Patient's height in centimeters.
        weight_kg (float): Patient's weight in kilograms.
    Returns:
        float: BSA in square meters (m²), rounded to two decimal places.
    """
    from math import sqrt
    bsa = sqrt((height_cm * weight_kg) / 3600)
    return round(bsa, 2)

The Mosteller formula is designed to work with height measured in centimeters and weight in kilograms. This is important because using other units, such as inches or pounds, would lead to incorrect results. In the function above, you provide the patient's height and weight in the correct units, and the function returns the BSA in square meters (m²), rounded to two decimal places for clarity. This output can be directly used in medication dosing calculations.


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# Example: Calculate BSA for a patient who is 170 cm tall and weighs 65 kg
height = 170  # centimeters
weight = 65   # kilograms

bsa = calculate_bsa_mosteller(height, weight)
print("The patient's BSA is:", bsa, "m²")
# Output: The patient's BSA is: 1.78 m²

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BSA (m²) = sqrt([height (cm) × weight (kg)] / 3600)

Using this formula, you can quickly determine a patient's BSA based on their height and weight, ensuring safer and more effective dosing.


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def calculate_bsa_mosteller(height_cm, weight_kg):
    """
    Calculate Body Surface Area (BSA) using the Mosteller formula.
    Args:
        height_cm (float): Patient's height in centimeters.
        weight_kg (float): Patient's weight in kilograms.
    Returns:
        float: BSA in square meters (m²), rounded to two decimal places.
    """
    from math import sqrt
    bsa = sqrt((height_cm * weight_kg) / 3600)
    return round(bsa, 2)


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# Example: Calculate BSA for a patient who is 170 cm tall and weighs 65 kg
height = 170  # centimeters
weight = 65   # kilograms

bsa = calculate_bsa_mosteller(height, weight)
print("The patient's BSA is:", bsa, "m²")
# Output: The patient's BSA is: 1.78 m²

Alt var klart?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 6

Calculating Body Surface Area (BSA) for Dosing

1. What is the Mosteller formula for BSA calculation?

2. Why is BSA used for dosing some medications?

3. What units should be used for height and weight in the BSA formula?

Calculating Body Surface Area (BSA) for Dosing

1. What is the Mosteller formula for BSA calculation?

2. Why is BSA used for dosing some medications?

3. What units should be used for height and weight in the BSA formula?