Serum-separating tube

A serum-separating tube or serum separator tube (SST) is a test tube used in clinical chemistry tests requiring blood serum.

SSTs are sometimes called "gold-topped tubes", "tiger-tops", or "marble-top tubes", referring to the colored stoppers which are either gold, red with a gold ring on top, or marbled red and grey. Stoppers on SPS (sodium polyanethol sulfonate) tubes have a paler yellow color, sometimes causing confusion; these are known as "yellow tops", not "gold". Trademarked versions of the SST include Covidien "Corvac" tubes.

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