Final answer:
Proper mixing tube additives with blood requires turning the wrist 180 degrees and back to gently invert the tube without causing damage to blood components.
Step-by-step explanation:
When properly mixing tube additives with blood, it requires gentle inversion. This inversion is typically done by turning the wrist 180 degrees and back, to ensure thorough mixing without causing hemolysis or foam formation. For example, when a lab technician collects a blood sample in a glass tube for serum analysis, careful mixing is necessary before processing. After blood collection, during the hour the sample sits at rest, the blood cells naturally settle and clotting occurs, which allows for the clear serum to be separated and used for further testing. In another instance, when adding solutions such as buffer and bovine serum albumin into a centrifuge tube, correct technique is crucial to ensure a representative sample is prepared for analysis.