label: Impaired flow-mediated arterial dilatation
label_lc: impaired flow-mediated arterial dilatation
description: "Flow-mediated dilatation is a noninvasive tests of endothelial function that leverages ultrasound to measure arterial diameter and its response to an increase in shear stress, which normally causes endothelium-dependent dilatation. This term pertains to an abnormal reduction in the magnitude of dilatation. Flow-mediated dilatation is usually measured at the brachial artery."