A number of primary containers, for combined specimen volume of 50 milliliters, may then be placed in one secondary container, such as a cardboard box or padded envelope. See individual laboratory sections for specific packaging instructions. All specimens and referral cultures should be sent first class mail or better to insure the quickest possible delivery to the laboratory. The submission form should be attached to the outside of the container, so that it will not be contaminated, if the specimen leaks or is broken. Specimens without proper packaging should not be transported.
Improper packaging places the courier, and possibly others, at great risk in case of an accident.
When dry ice is used as a refrigerant, it must be placed on the outside of a secondary container, and never be placed in a sealed container. If it is placed between the secondary container and the shipping container, enough shock- absorbent material must be added so that the secondary container does not become loose as the dry ice sublimates. Questions about postage or shipping cost should be directed to the carrier used.