Serum-separating tube - Wikipedia
https://en.m.wikipedia.org/wiki/Serum-separating_tube
Serum-separating tubes, also known as serum separator tubes or SSTs, are test tubes used in clinical chemistry tests requiring blood serum. SSTs are sometimes called "marble-top tubes", "tiger-tops", or "gold-topped tubes", referring to the stoppers which are either gold, red with a gold ring on top, or marbled red and grey. The stopper of SPS (sodium polyanethol sulfonate) tubes have a paler yellow colour, s…
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