What is a primary container used for packing specimens?

The primary container is crucial in the specimen collection and transport process, serving as the initial point of containment for biological samples. A collection tube is designed specifically for this purpose, as it is sterile and ensures that the specimen remains uncontaminated, preserving its integrity for testing and analysis. It is equipped with features such as a vacuum seal for optimal draw and often has specific additives to stabilize or preserve the specimen, depending on its intended analysis.

While other options play important roles in the transportation and handling of specimens, they serve different purposes. A biohazard bag is intended for securing the primary container during transport, providing an additional layer of safety and protection. The strong outer package is used to further safeguard specimens from potential breakage or contamination during shipment but does not hold the specimen itself. A secondary container is utilized to provide extra protection to the primary container during transport, ensuring that if the primary container leaks or breaks, the secondary container can contain the specimen and prevent exposure to contaminants.

Thus, the collection tube is the correct choice as the primary container specifically designed for holding and preserving specimens for laboratory analysis.