Patent ID: 7674388

Claim:
A serum separator tube containing a blood separator composition comprising: a curable composition disposed within the tube, and that is formulated to have a density between an average density of a serum fraction of whole blood and a cell-containing fraction of whole blood, and that is further formulated to be mixable with or flowable in whole blood before curing, and to be solid and immobilized after curing; wherein the curable composition comprises a flowable polymerizable compound formed from polymerizing a first portion of a plurality of reactive groups of the curable composition, and having a second portion of the plurality of reactive groups in an amount effective to form a solid, immobilized crosslinked composition upon initiation of crosslinking through curing the curable composition; and wherein the curable composition forms a barrier between the fractions due to separation, and upon curing forms the crosslinked composition in a manner where the barrier becomes solid, immobilized, and impermeable to the cell-containing fraction of whole blood.