calculated sperm count sperm count to epididymis weight ratio 2013-06-10T17:57:35Z A calculated measurement in which the number of sperm, i.e. mature male germ cells, in a specified sample of semen, is divided by the weight, i.e., the heaviness, of the epididymis, the coiled, elongated, cordlike structure located along the posterior border of the testis which provides for storage, transit, and maturation of spermatozoa. The result of this division is presented as a ratio, fraction, quotient or percentage, thus normalizing sperm count to the size of the epididymis and, by extension, to the size of the organism. CMO:0001609 JSmith VT:0002673 clinical_measurement_ontology