L/min/m2 is the unit of measure for:

L/min/m² is the unit of measure for cardiac index. Cardiac index is a crucial parameter that relates a patient's cardiac output to their body surface area, allowing for a more normalized assessment of heart function regardless of the size of the patient. This normalization is essential because cardiac output alone does not account for the variations in body size among individuals.

By using L/min/m², clinicians can evaluate the effectiveness of the heart's pumping capacity in terms of how well it meets the metabolic demands of the body, making it a valuable tool in both clinical and critical care settings.

The other options do not utilize this specific unit of measure. Systemic vascular resistance is typically measured in units of dynes·sec/cm⁵ or mmHg/L/min, cardiac output is measured in L/min without normalization to body surface area, and stroke volume is usually expressed in milliliters (ml). Thus, the designation of L/min/m² uniquely identifies cardiac index as an important hemodynamic measurement.