NCIt related terms : RAE; Retinol Activity Equivalent; {RE};
NCIt definition : An arbitrary unit for measurement of a vitamin A activity of provitamin A carotenoids
(such as carotenes, xanthophylls, and compounds that arise from rearrangement of carotene
I skeleton) in a mixed diet introduced by FAO/WHO Expert Group in 1967. The concept
of the retinol equivalent (RE) is established on the following relationships among
food sources of the vitamin A: one microgram of all-trans retinol is equal to one
RE, one microgram of beta-carotene is equal to 0.167 RE, and one microgram of other
pro-vitamin A carotenoids is equal to 0.084 RE.;
Alternative definition : CDISC: A unit of biological activity expressed in equivalents of retinol activity.;