vascular endothelial function measurement (Experimental Factor Ontology entry EFO_0803369) is quantification of vascular endothelial function. Endothelial function tests assess vascular tone, permeability, anticoagulation, and angiogenesis. They include non-invasive measures like the reactive hyperemia index (RHI) detected by pulse amplitude tonometry (PAT) or invasive procedures like cardiac catherization. Endothelial dysfunction results in aging-induced pathogenesis of both microvascular and macrovascular diseases.