MSU Test: Understanding Midstream Urine Collection & Urinalysis

The medical abbreviation MSU stands for midstream urine. It refers to a urine sample that is collected from a person while they are urinating, rather than from a catheter or from a container that has been placed in the toilet bowl. MSU samples are often used for urinalysis, which is a test that analyzes the physical, chemical, and microscopic properties of urine.