Temperature Monitoring of Two Different Thermal Boxes for the Transport of Biological Samples.

BACKGROUND: According to the Resolutions of the Collegiate Board of Directors RDC No. 20/2014, 214/2018, and 707/2022, validation of the temperature of thermal boxes for the transport of biological samples must be based on standardized procedures and tested by the Tissue Banks, guaranteeing safety and quality. Therefore, they can be simulated. Our objective was to monitor and compare the temperature of 2 different coolers while transporting biological samples.

METHODS: The following items were packed in each of the 2 different thermal boxes (Box 1: Easy Path; Box 2: Safe Box Polyurethane Vegetal): 6 blood samples (30 mL), one bone tissue sample (200 g), 8 hard ice (Gelox, to keep the temperature <8ºC), and internal and external traceability "Time Stamp" sensors installed for measuring and storing temperature data in real-time. The monitored boxes were placed in the trunk of a bus that traveled an approximate distance of 630 km and were then placed in the trunk of a car, under direct sunlight, until they reached a temperature of 8ºC.

RESULTS: In Box 1, the internal temperature was maintained in the range of -7ºC to 8ºC for approximately 26 hours. In Box 2, the internal temperature was maintained in the range of -10ºC to 8ºC for approximately 98 hours and 40 minutes.

CONCLUSIONS: We concluded that both coolers, under similar storage conditions, are suitable for transporting biological samples, with Box 2 maintaining the desired temperature for longer.