Which of the Following Statements Concerning the Laboratory Diagnosis of Urinary

Multiple Choice

Which of the following statements concerning the laboratory diagnosis of urinary tract infections is TRUE?

A) All urine samples contain some microorganisms because the bladder has a normal microbiota.
B) A midstream specimen of urine (MSU) is usually the most appropriate specimen to collect.
C) Urine is toxic for all microorganisms and thus should not be allowed to stand after collection.
D) Any bacteria found in a urine specimen is indicative of infection.
E) Contamination of a urine specimen is usually by microorganisms from the air.