One of the most important uses of the Gram stain of expectorated sputum received for routine bacteriologic culture is to:
a. give the physician a quick analysis of the type of organism causing the infection.
b. evaluate the quality of the specimen.
c. distinguish between the possibilities of bacterial and viral sources of infection.
d. begin appropriate antimicrobial therapy as soon as possible.
B
The respiratory secretions sent to the laboratory for bacterial culture should be microscopically examined via Gram-stained smear. One of the most important uses of the Gram stain is to eva-luate the quality of expectorated sputum received for routine bacteriologic culture. An acceptable specimen yields less than 10 squamous epithelial cells per low-power field (100ยด).
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