midstream specimen of urine

views updated

midstream specimen of urine (MSU) (mid-streem) n. a specimen of urine that is subjected to examination for the presence of microorganisms. In order to obtain a specimen that is free of contamination, the periurethral area is cleansed and the patient is requested to discard the initial flow of urine before collecting the specimen in a sterile container.

More From encyclopedia.com