Count how many of the patient's own hands would cover the burned area. By convention the whole hand, palm and fingers, is 1% of body surface area. Count partial and full thickness burns only, not simple redness.
What you enter
Number of the patient's hand areas covering the burn (hands)
What you measured with: Whole hand, palm and fingers (1% by convention) / Palm only, without fingers (about 0.5%)
FORMULA%TBSA = number of hand areas x 1% (whole hand) or x 0.5% (palm only)
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