Body Surface Area Calculator - for Skin Disorders - Medical Algorithm

The chart of Lund and Browder for percent body surface area (BSA) in a given body region can be used to describe the extent of skin disorder.

Parameters:

(1) age in years

(2) body region

(3) severity of skin involvement (none, mild, moderate, severe)

Lund and Browder Chart	1 Year	1-4 Years	5-9 Years	10-14 Years	15 Years	Adult
head	19	17	13	11	9	7
neck	2	2	2	2	2	2
anterior trunk	13	13	13	13	13	13
posterior trunk	13	13	13	13	13	13
right buttock	2.5	2.5	2.5	2.5	2.5	2.5
left buttock	2.5	2.5	2.5	2.5	2.5	2.5
genitals	1	1	1	1	1	1
right upper arm	4	4	4	4	4	4
left upper arm	4	4	4	4	4	4
right lower arm	3	3	3	3	3	3
left lower arm	3	3	3	3	3	3
right hand	2.5	2.5	2.5	2.5	2.5	2.5
left hand	2.5	2.5	2.5	2.5	2.5	2.5
right thigh	5.5	6.5	8	8.5	9	9.5
left thigh	5.5	6.5	8	8.5	9	9.5
right leg	5	5	5.5	6	6.5	7
left leg	5	5	5.5	6	6.5	7
right foot	3.5	3.5	3.5	3.5	3.5	3.5
left foot	3.5	3.5	3.5	3.5	3.5	3.5

extent of involvement by a degree of skin disease in a region =

= (percent of body surface area in a region) * (percent of region showing that level of severity) / 100

The sum of the areas for each region should add up to 100%.

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Estimating the Body Surface Area Involvement by a Skin Disorder Using the Chart of Lund and Browder