What catheter-tip culture threshold is used to confirm CLABSI?

What catheter-tip culture threshold is used to confirm CLABSI?

• A. >10 CFU
• B. >15 CFU
• C. >25 CFU
• D. >20 CFU

Answer: (B)

In evaluating CLABSI, you confirm the catheter as the infection source by showing significant catheter-tip colonization with the same organism found in the blood. The standard way to do this is a semiquantitative culture of the catheter tip. If the number of colony-forming units on the catheter tip exceeds the cutoff, it indicates meaningful colonization rather than mere contamination. The accepted threshold for this significant colonization is more than 15 CFU. When the catheter-tip culture yields a matching organism from the blood culture and the tip count is above that threshold, it strongly supports the catheter as the source of the bloodstream infection. Counts well below the cutoff are less convincing evidence of a catheter source.

In evaluating CLABSI, you confirm the catheter as the infection source by showing significant catheter-tip colonization with the same organism found in the blood. The standard way to do this is a semiquantitative culture of the catheter tip. If the number of colony-forming units on the catheter tip exceeds the cutoff, it indicates meaningful colonization rather than mere contamination. The accepted threshold for this significant colonization is more than 15 CFU. When the catheter-tip culture yields a matching organism from the blood culture and the tip count is above that threshold, it strongly supports the catheter as the source of the bloodstream infection. Counts well below the cutoff are less convincing evidence of a catheter source.