Guide to Diagnostic TestsSearch Guide to Diagnostic TestsABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZOdds-likelihood ratiosOGTT (oral glucose tolerance test)Oligoclonal bandsOligomenorrheaOmeprazoleOpioidsOral contraceptivesOral glucose tolerance testOrange RST tubeOrchitisOrgan donor screeningOsm (osmolality)Osmol gapsOsteocalcinOsteomyelitisOsteopeniaOsteoporosisOtitis externaOtitis mediaOvarian cancerOvarian failureOxcarbazepineOxygen partial pressure