The Clinical Measurement Ontology (CMO), Measurement Methods Ontology (MMO), and Experimental Condition Ontology (XCO) are currently being developed at the Rat Genome Database. For more information about these vocabularies please see Shimoyama et al. Three ontologies to define phenotype measurement data. Front Genet. 2012;3:87. Epub 2012 May 28 or contact us (http://rgd.mcw.edu/contact/index.shtml).
A calculated measurement in which urine sodium excretion rate is divided by the total weight of the body, i.e., the heaviness or the degree to which the body of the organism is drawn toward the earth by gravity, and presented as a ratio, fraction, quotient or percentage. Urine sodium excretion rate is the amount of sodium, the chemical element with atomic number 11, discharged in the urine, the fluid waste product separated and discharged by the kidneys, per unit time.