Clinical chemistry the denser blood cells and platelets to the bottom of the centrifuge tube, leaving the liquid serum fraction resting above the packed cells. This initial step before analysis has recently been included in instruments that operate on the "integrated system" principle. Plasma is in essence the same as serum, but is obtained by centrifuging the blood "without" clotting. Plasma is obtained by centrifugation "before" clotting occurs. The type of test required dictates what type of sample is used. A large medical laboratory will accept samples for up to about 700 different kinds of tests. Even the largest of laboratories rarely
Blood, Sweat & Tears (Blood, Sweat & Tears album) Blood, Sweat & Tears (Blood, Sweat & Tears album) Blood, Sweat & Tears is the second album by the band Blood, Sweat & Tears, released in 1968. It was commercially successful, rising to the top of the U.S. charts for a collective seven weeks and yielding three successive Top 5 singles. It received a Grammy Award for Album of the Year in 1970 and has been certified quadruple platinum by the RIAA with sales of more than four million units in the U.S. In Canada, it enjoyed four runs and altogether eight weeks at No. 1 on the "RPM" national