VACUETTE® serum tubes are coated with micronised silica particles which activate clotting when tubes are gently inverted. These tubes are used for routine clinical chemistry, immunohematology, serology and immunology testing.

These serum tubes with gel contain a barrier gel that is present in the bottom of the tube. During centrifugation, the barrier gel moves upward to the serum-clot interface where it forms a stable barrier, separating the serum from the cells.