cardiac index

noun

: a measure of cardiac output per square meter of body surface area

Her cardiac output (as measured by thermodilution) was 6 liters per minute (reference range, 4 to 8), with a cardiac index of 3.3 liters per minute per square meter of body-surface area (reference range, 2.5 to 4.0).

—Zoltan P. Arany et al., The New England Journal of Medicine