Many times, the clots are simply fibrin, which does not usually yield the cells the pathologist are looking for.  If you spin down the fluid, the cells that the pathologist wants to see are found in the button, however small, in the bottom of the tube.  We  used 50 ml tubes and spun them down.  If the specimen is scant, you can always make smears, or use histogel to keep the clot intact.  Either way, you obtain far superior results spinning down the unclotted fluid, rather than just using the clot.

       
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