What is a common error during blood culture collection that can lead to false negatives?

• A. Collecting from multiple sites
• B. Using sterile technique
• C. Labeling correctly
• D. Drawing from the same site multiple times or contamination of the site; ensure proper skin antisepsis.

Answer: (D)

A key part of getting accurate blood culture results is keeping the sample free from skin contamination. Drawing from the same venipuncture site multiple times increases the chance that skin flora or residual antiseptic and local contaminants enter the specimen. When the sample is contaminated, the culture can be unreliable and may fail to reflect the true bloodstream infection, leading to a negative or inconclusive result even if bacteria are present. Using proper skin antisepsis minimizes this contamination risk and improves the likelihood that the culture detects the actual pathogens. Remember, collecting from multiple sites is good practice to improve detection, not an error.