Serum-separating tube Serum-separating tube Serum-separating tubes, also known as serum separator tubes or SSTs, are used in medical 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. Marble-top tubes are also referred to as "tiger-tops" in some clinics. SPS tubes have a paler colour, sometimes leading confusion; these are known as "yellow tops" not "gold". Trademarked versions include Covidien "Corvac" tubes. They contain a special gel that separates blood cells from serum, as well as
Super Hits (Blood, Sweat & Tears album) Super Hits (Blood, Sweat & Tears album) Super Hits is a budget compilation album by the band Blood, Sweat & Tears released by Columbia Records in 1998. This ten song collection draws four songs from each of the band's first two albums "Child Is Father to the Man" and "Blood, Sweat & Tears". Writing for Allmusic, critic Al Campbell wrote, "Super Hits samples ten tracks recorded by Blood, Sweat & Tears for Columbia Records in the late '60s and early '70s and includes the original versions of "Spinning Wheel," "You've Made Me So Very Happy" and "And When I Die."