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
Super Hits (Blood, Sweat & Tears album) Super Hits (Blood, Sweat & Tears album) Super Hits is a budget compilation album by the band Blood, Sweat & Tears released by Columbia Records in 1998. This ten song collection draws four songs from each of the band's first two albums "Child Is Father to the Man" and "Blood, Sweat & Tears". Writing for Allmusic, critic Al Campbell wrote, "Super Hits samples ten tracks recorded by Blood, Sweat & Tears for Columbia Records in the late '60s and early '70s and includes the original versions of "Spinning Wheel," "You've Made Me So Very Happy" and "And When I Die."