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 and Tears (album) personnel Album - Billboard (North America) Singles - Billboard (North America) Blood, Sweat and Tears (album) Blood, Sweat and Tears is the fifteenth album by singer Johnny Cash, released in 1963 (see 1963 in music). It is a collection of songs about the American working man. This includes "The Legend of John Henry's Hammer" and "Busted", the latter of which would become a single. Both would also be performed by Cash during his famous 1968 concerts at Folsom Prison and be included in the 1999 extended reissue of the album, "At Folsom Prison". The album was included on the Bear