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
New Blood (Blood, Sweat & Tears album) New Blood (Blood, Sweat & Tears album) New Blood is the fifth album by the band Blood, Sweat & Tears, released in 1972. With David Clayton-Thomas leaving as lead vocalist to pursue a solo career after the release of "BS&T 4", a nearly wholesale personnel change occurred for "New Blood". Difficulties had arisen inside the group between its pop-rock and jazz factions, with Clayton-Thomas choosing to leave in early January 1972, along with founding member Fred Lipsius. Clayton-Thomas was briefly replaced by Bobby Doyle, and a photo of the band appeared in Down Beat showing a new lineup also including