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BSA Calculator

Calculate Body Surface Area using Mosteller, Du Bois, and Boyd formulas.

BSA算出式の比較

BSAの臨床的な応用

この計算機は4つの主要なBSA算出式すべての結果を表示するため、それぞれを比較してお使いの臨床状況に最も適した式を選択できます。

⚠️ この計算機は情報提供のみを目的としています。医薬品の用量に関するすべての決定は資格を持つ医療専門家が行う必要があります。

  • Mosteller(1987年):BSA = √(H × W / 3600) — シンプルで精度が高く、腫瘍学で最も広く使われています
  • Du Bois & Du Bois(1916年):BSA = 0.007184 × H^0.725 × W^0.425 — 9名を対象とした最古の式で、現在も広く引用されています
  • Haycock(1978年):BSA = 0.024265 × H^0.3964 × W^0.5378 — 小児集団での検証済み
  • Boyd(1935年):BSA = 0.0003207 × H^0.3 × (W×1000)^(0.7285 − 0.0188 log(W×1000)) — 新生児に適しています
  • 化学療法の投与量:ほとんどの抗がん剤はBSA(m²)あたりのmgで投与量が設定されています。例えば、カルボプラチンは300〜450 mg/m²で処方されることが多いです。
  • 心係数:CI = 心拍出量(L/分)÷ BSA(m²)。正常範囲は2.5〜4.0 L/分/m²。
  • 熱傷の評価:「9の法則」は、輸液蘇生の指針として熱傷によるBSAの割合を推定します。

よくある質問

What is Body Surface Area (BSA)?
Body Surface Area (BSA) is a measurement of the total surface area of the human body, expressed in square metres (m²). It is more accurate than body weight for many clinical calculations because it better represents metabolic mass and accounts for differences in body composition.
Why is BSA used in medicine?
BSA is widely used for calculating chemotherapy drug doses, where dosing errors can be life-threatening. It is also used for calculating cardiac index (cardiac output normalised to BSA), glomerular filtration rate in paediatrics, caloric requirements, and burn area assessments.
Which BSA formula is most accurate?
The Mosteller formula (1987) is the most commonly used in modern clinical practice due to its simplicity and good accuracy: BSA = √(height × weight / 3600). The Du Bois formula (1916) is older but still widely cited in literature. The Haycock formula is preferred for paediatric patients. The Boyd formula is used for neonates.
What is the average BSA for an adult?
The average BSA for a healthy adult male is approximately 1.9 m² and for an adult female approximately 1.6 m². Paediatric values range from 0.25 m² for neonates to 1.33 m² for 10-year-olds. These values are used as reference standards in drug dosing guidelines.
What is the Mosteller formula?
The Mosteller formula is: BSA (m²) = √(Height (cm) × Weight (kg) / 3600). It is simple, accurate, and widely adopted in oncology protocols. For a person 170 cm tall weighing 70 kg: BSA = √(170 × 70 / 3600) = √3.306 ≈ 1.818 m².

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