Method and apparatus for separating serum or plasma from {HEAD ~ the formed elements} of {TAIL ~ the blood} 
Method and apparatus for separating serum or plasma from { HEAD ~ the formed elements } of { TAIL ~ the blood }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL