Which specimens require warm collection and transportation?

Warm collection and transportation are necessary for certain specimens that are sensitive to temperature changes, particularly those that may precipitate or become unstable when exposed to cold conditions. In this context, cryoglobulin and cryofibrinogen testing are specifically affected by temperature, as they can form precipitates when the blood sample cools. Cold agglutinin testing is also temperature-sensitive, as it involves red blood cells that can agglutinate when exposed to cold.

These specimens require careful handling to maintain their integrity; therefore, they should be collected and transported at body temperature or in a warmed environment to prevent any changes that could affect the results. Keeping them warm ensures that the proteins remain in solution and provides accurate testing outcomes.

In contrast, the other options consist of tests that do not have similar strict temperature requirements. For example, bilirubin and Vitamin B12 testing have specific light sensitivity issues rather than temperature concerns.