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 (https://rgd.mcw.edu/rgdweb/contact/contactus.html).
A method which utilizes a metabolic cage, a housing unit constructed for the separate collection of liquid and solid wastes and in some cases for measurement of liquid waste, to determine the size of the three dimensional space occupied by a sample of urine, the fluid waste product excreted by the kidneys.