Wound Culture Storage and Transport
Yes, refrigerate wound culture specimens if they cannot be sent to the laboratory within 2 hours. 1
Storage Guidelines
According to the Infectious Diseases Society of America (IDSA) and American Society for Microbiology (ASM) guidance, the standard protocol for wound culture specimens is:
- Transport at room temperature if delivery to the laboratory occurs within 2 hours 1
- Refrigerate the specimen after 2 hours if immediate transport is not possible 1
- Store in a sterile container at room temperature initially, then refrigerate if the 2-hour window is exceeded 1
Key Transport Principles
The general rule established in the 2018 IDSA/ASM laboratory utilization guide states: "When room temperature is specified for a certain time period, such as 2 hours, it is expected that the sample should be refrigerated after that time unless specified otherwise." 1
Specimen Type Considerations
For wound cultures specifically:
- Tissue biopsies or resected material (preferred over swabs): Sterile container, room temperature, with immediate transport ideal 1
- Wound swabs: Follow the same 2-hour rule for refrigeration 2
- Tissue specimens are always superior to swab specimens, even when collected using sterile technique 1
Important Caveats
- Viral cultures are an exception: These require transport on wet ice and freezing at -80°C if testing is delayed beyond 48 hours 1
- Fungal cultures: Can tolerate room temperature for up to 2 hours before requiring refrigeration 1
- Anaerobic cultures: May have different requirements; consult your laboratory if anaerobes are suspected 1
Practical Application
The 2-hour threshold is critical because bacterial viability and accurate quantification can be compromised with prolonged room temperature storage, while refrigeration helps preserve the specimen integrity for culture 1. Always transport specimens as quickly as possible, but if delays are unavoidable, refrigeration after 2 hours is the appropriate action.