blood chemistry measurement blood vitamin level 2021-04-30T11:58:53Z CMO:0003698 EFO:0004729 The amount of a vitamin in a specified volume of blood. A vitamin is any of various organic substances that are essential in minute quantities to the nutrition of most animals and some plants, act especially as coenzymes and precursors of coenzymes in the regulation of metabolic processes, but do not provide energy or serve as building units, and are present in natural foodstuffs or sometimes produced within the body. clinical_measurement_ontology slaulede vitamin measurement