- UMLS. CSP-HL7-ICD9CM-NCI-NDFRT-RXNORM

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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

R R R- R0 R1 R2 R3 R4 RA RB RC RD RE RF RG RH RI RK RM RN RO RP RQ RR RS RT RU RV RW RX RY

RE RE- REA REB REC RED REE REF REG REH REI REJ REL REM REN REO REP REQ RER RES RET REU REV REW REX

[An arbitrary unit for measurement the efficiency with which ingested provitamin A carotenoids (such as carotenes, xanthophylls, and compounds that arise from rearrangement of carotene I skeleton) are absorbed and converted to the active form of vitamin A in a mixed diet. The concept of retinol equivalent (RE) introduced by FAO/WHO Expert Group in 1967, is established on the following relationships among food sources of vitamin A based on carotenoids bioavailability and bioconversion data: one microgram of 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. ( NCI )]

UMLS (NCI) C0556581

Quantitative Concept

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