What should never be used to store a blood sample?

Using dry ice to store a blood sample is inappropriate because it can cause the sample to freeze, which may alter or destroy the cellular components and proteins essential for accurate laboratory analysis. Blood samples often need to be maintained at specific temperatures to ensure the integrity of the cells, enzymes, and other molecules present in the sample.

For example, many blood samples require refrigeration or storage at room temperature, depending on the type of test being performed. While ice water and refrigeration can help preserve samples for certain tests, dry ice is too extreme and can lead to irreversible changes in the sample. Therefore, choosing the correct storage method is crucial for obtaining reliable and valid test results.