Patent ID: 7153477

Claim:
A specimen sample tube assembly for separating a fluid sample contained therein into higher and lower specific gravity phases comprising: an elongate sample tube having an open end, a closed end and a cylindrical tube wall therebetween; a closure positionable over said open end of said tube; a separator assembly positioned within said tube and releasably coupled to said closure, said separator assembly being releasable under centrifugation which separates said phases of said fluid sample; said separator assembly being movable upon said release to a position between and separating said phases of said fluid; said separator assembly comprising a low density plastic body and a high density elastomeric seal diaphragm; said plastic body comprising a hollow core and a hollow chamber surrounding said hollow core; said elastomeric seal diaphragm comprising a fill septum and annular skirt; said plastic body being nested with said elastomeric seal diaphragm whereby said hollow core of said plastic body is in direct communication with said fill septum of said elastomeric seal diaphragm.