Glass or silica particles are found in which type of blood collection tube?

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Multiple Choice

Glass or silica particles are found in which type of blood collection tube?

Silica-based clot activators speed up clot formation to produce serum, which is what serum tubes are designed to yield. Red-top tubes, used for serum tests, are typically filled without anticoagulants and often contain a silica-containing clot activator (even when the tube is plastic). This is why glass or silica particles are associated with this tube type. Blue-top and green-top tubes contain anticoagulants (citrate or heparin) to prevent clotting, so they aren’t designed around clot activators like silica. Historical glass tubes relied on silica surfaces to promote clotting, but in modern practice the plastic red-top tube with a silica-based activator represents that feature.

Silica-based clot activators speed up clot formation to produce serum, which is what serum tubes are designed to yield. Red-top tubes, used for serum tests, are typically filled without anticoagulants and often contain a silica-containing clot activator (even when the tube is plastic). This is why glass or silica particles are associated with this tube type. Blue-top and green-top tubes contain anticoagulants (citrate or heparin) to prevent clotting, so they aren’t designed around clot activators like silica. Historical glass tubes relied on silica surfaces to promote clotting, but in modern practice the plastic red-top tube with a silica-based activator represents that feature.

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