A Tube Coagulase Test Was Performed on Catalase-Positive, Gram-Positive Cocci

question 8

Multiple Choice

A tube coagulase test was performed on catalase-positive, gram-positive cocci that were beta hemolytic and grew on mannitol salt agar.The tube was checked after overnight incubation and was negative.Which of the following statements explains this discrepancy?

• A) A tube coagulase should not be performed on a catalase-positive organism.
• B) A beta-hemolytic colony, which is catalase positive and grows on mannitol salt, is normally coagulase negative.
• C) The test should have been read in 1 to 4 hours in case any hemolysins are present.
• D) No discrepancy is present; the results are accurate.

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