Proper Storage of Pus Samples for Culture and Sensitivity

Recommended Storage Conditions for Pus Samples

• Pus samples should be processed as soon as possible after collection to ensure optimal recovery of microorganisms and accurate sensitivity results 1
• If immediate processing is not possible, samples should be stored at 4°C (refrigerated) for up to 12 hours, not frozen 2
• Freezing can damage bacterial cells and affect the viability of microorganisms, potentially leading to false-negative culture results 1, 2

Proper Collection and Transport Procedures

• Collect pus samples in sterile containers that do not promote cell adherence to container surfaces 1
• If processing will be delayed by 30-60 minutes, transport the sample at 4°C (on ice) 1, 2
• For delays exceeding 1 hour but less than 12 hours, refrigeration at 4°C is essential 1, 2
• Do not freeze pus samples as this can compromise microbial viability 1, 2

Special Considerations

• If sample processing will be delayed beyond 12 hours, consider adding appropriate transport media to preserve bacterial viability, though this is not ideal 1

Common Pitfalls to Avoid

• Never freeze pus samples intended for culture and sensitivity as freezing damages bacterial cell membranes 1
• Avoid storing samples at room temperature for extended periods as this allows for bacterial overgrowth or death 3
• Do not delay processing beyond 12 hours even with refrigeration, as this significantly reduces recovery of fastidious organisms 1, 2