BSA Idealizer
Calculate BSA and BMI and, in cases of abnormal weight, calculates the "idealized" BSA associated with a "normal" BMI.
No need to "idealize" BSA! (BMI is within normal range)
This BMI is associated with . If this person had a BMI of , the weight would be . Recalculating the BSA using this weight will give us the "idealized BSA":
About
Most echocardiographic (also MRI and CT!) normal values are routinely adjusted for body size. Body surface area (BSA) is the most commonly used parameter with which we do this.
Yet, heart size might not always scale with BSA in cases of abnormal weight.
A strategy proposed for correcting body size in these abnormal weight conditions is to adjust the weight to that of an equivalent "normal" body mass index (BMI), like this:
What this calculator does:
- Calculate the BSA
- Calcualte the BMI (weight (kg) ÷ height (meters)2)
- If the BMI is abnormal (less than 18.5 or greater than 25)
- Calculate the "idealized" weight at that threshold
- Re-calculate the BSA using the "idealized" weight, giving the "idealized" BSA
To read more about this strategy of normalizing BSA, please read
- Normal Values of Left Atrial Size and Function and the Impact of Age: Results of the World Alliance Societies of Echocardiography Study.
- Singh A, Carvalho Singulane C, Miyoshi T. et al.
- J Am Soc Echocardiogr. 2022 Feb;35(2):154-164.
To learn more about BSA equations, please read
- Body surface area formulae: an alarming ambiguity.
- Redlarski G, Palkowski A, Krawczuk M.
- Sci Rep. 2016 Jun 21;6:27966.
To learn more about the BMI thresholds used here, please visit the CDC page at https://www.cdc.gov/healthyweight/assessing/bmi/adult_bmi/index.html