How is CLABSI diagnosed when suspected from clinical presentation?

How is CLABSI diagnosed when suspected from clinical presentation?

• A. Paired blood cultures from the central line and a peripheral vein
• B. Urine culture
• C. Chest X-ray
• D. Catheter tip culture only

Answer: (A)

When CLABSI is suspected from clinical signs, the way to confirm it is by showing that the bloodstream infection is linked to the central line. This is best done with paired blood cultures: draw one sample through the catheter and another from a peripheral vein, ideally close in time. If the same organism grows in both samples and the culture from the catheter becomes positive earlier than the peripheral one (a differential time to positivity, usually by about 2 hours or more), this pattern indicates catheter-related bloodstream infection. Relying on catheter-tip culture alone isn’t sufficient to diagnose CLABSI, because it only shows colonization of the line and doesn’t prove the bloodstream source. Urine culture or a chest X-ray address other potential infection sources but don’t establish CLABSI.

When CLABSI is suspected from clinical signs, the way to confirm it is by showing that the bloodstream infection is linked to the central line. This is best done with paired blood cultures: draw one sample through the catheter and another from a peripheral vein, ideally close in time. If the same organism grows in both samples and the culture from the catheter becomes positive earlier than the peripheral one (a differential time to positivity, usually by about 2 hours or more), this pattern indicates catheter-related bloodstream infection. Relying on catheter-tip culture alone isn’t sufficient to diagnose CLABSI, because it only shows colonization of the line and doesn’t prove the bloodstream source. Urine culture or a chest X-ray address other potential infection sources but don’t establish CLABSI.