What is a key requirement for mailing blood samples?

Mailing blood samples requires that they must be securely packaged and labeled to ensure they arrive safely and can be accurately identified upon receipt. Proper packaging protects the samples from breakage and contamination, while accurate labeling provides essential information such as patient identification, the type of test required, and any specific handling instructions. This is crucial for maintaining the integrity of the samples during transport and for facilitating the processing in the laboratory.

The requirement for samples to be frozen, sending them only on weekdays, or processing them immediately does not universally apply to all blood samples and can vary based on the type of test being performed. Therefore, the necessity for secure packaging and labeling is the most critical requirement for mailing blood samples responsibly.