Cryopreserved perinatal tissue products are brought to a storage temperature around -80 degrees Celsius using a controlled, gradual cooling step rather than being placed directly into a freezer, since an uncontrolled temperature drop can affect material differently than a gradual one.
Because the product must stay at low temperature continuously, cryopreserved formats are shipped on dry ice in insulated, validated containers built to hold temperature for the expected transit time. The receiving clinic is responsible for moving the product promptly into its own qualified storage. This is the basis for cold-chain recordkeeping: a documented, continuous temperature history from the supplier's freezer to the clinic's.
Not every format in a supplier's catalog is cryopreserved; some are lyophilized specifically so they do not require cryogenic storage or dry-ice shipping. A buyer comparing formats should check which storage and shipping requirements apply to each product, since the operational burden on freezer capacity, receiving logistics, and shipment delays differs between a cryopreserved and a lyophilized version of a similar product.
Cryopreserved formats require freezer capacity and tight receiving logistics on the clinic side, which is a real operational cost to weigh against a lyophilized alternative.