Which of the following describes the correct method for obtaining a wound culture sample?

• A. Swab viable tissue, press swab into tissue (produce fluid) and rotate for 5 seconds, don't touch skin or wound edges, label specimen
• B. Swab around the wound edges to collect skin contaminants
• C. Collect a sample from necrotic tissue only
• D. Obtain tissue biopsy sample rather than swab

Answer: (A)

Accurate wound culture hinges on sampling from the wound bed itself, not from the edges or surrounding skin, so you’re testing the organisms actually causing infection rather than surface contaminants. The best method described is to use a sterile swab and press it into viable tissue in the wound bed to express some fluid, then rotate the swab for about a few seconds to collect organisms. This approach targets the organisms living in the tissue where infection is occurring and provides a representative sample for culture.

Avoiding contact with the skin and wound edges minimizes contamination from skin flora that can be present around the wound, helping prevent misleading results. Labeling the specimen is essential for proper processing and tracking in the lab.

Sampling necrotic tissue alone can be misleading because it may not reflect the organisms present in viable tissue that are driving infection, and swabbing around the wound edges tends to pick up surface contaminants rather than the infectious organisms in the wound bed. Tissue biopsy is more invasive and is usually reserved for cases where a swab is inconclusive or when a deeper infection is suspected.