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).
The clearance rate of creatinine, that is, the volume of plasma that is cleared of creatinine by the kidneys per unit time. Creatinine clearance is calculated using the level of creatinine in a sample of urine, usually one collected over a period of 24 hours, the corresponding plasma creatinine level, and the volume of urine excreted. It is used as an approximation of the glomerular filtration rate (GFR).