Final answer:
To check for clots after centrifugation, specimens are visually inspected by slightly rocking the tube and then examining it for clumping. Microscopic analysis of a smear may also be conducted for detailed examination.
Step-by-step explanation:
After centrifugation, specimens can be checked for clots by visually inspecting the separated components of the specimen. This process usually involves gently rocking the tube back and forth to mix the contents slightly without causing any disturbance to the layers formed by centrifugation. Afterwards, the tube is left undisturbed for a short period, and a close inspection is performed to identify any clumps or irregularities that would indicate the presence of clots.
In the context of blood processing, for example, the supernatant plasma is observed for clarity and the absence of clotting. Additionally, making a smear of the specimen and observing it under a microscope can help identify clots as well as assess the condition and quality of the red blood cells, platelets, and populations of white blood cells if this is relevant to the procedure. This is a fundamental step in various laboratory protocols including those relating to DNA extraction and blood sample analysis.