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2. Vacutainer - Wikipedia

   en.wikipedia.org/wiki/Vacutainer

   A range of Vacutainer tubes containing blood. A vacutainer blood collection tube is a sterile glass or plastic test tube with a colored rubber stopper creating a vacuum seal inside of the tube, facilitating the drawing of a predetermined volume of liquid. Vacutainer tubes may contain additives designed to stabilize and preserve the specimen ...

3. Tube (container) - Wikipedia

   en.wikipedia.org/wiki/Tube_(container)

   A multi-layer plastic tube. The earliest collapsible tubes were made of tin, zinc, or lead, sometimes coated with wax on the inside. [4] [5] Aluminum tube caps and closures are generally threaded, as is the nozzle. Aluminium tubes generally have the far end folded several times after the contents have been added.

4. Test tube - Wikipedia

   en.wikipedia.org/wiki/Test_tube

   A test tube, also known as a culture tube or sample tube, is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom. Test tubes are usually placed in special-purpose racks.

5. Serum-separating tube - Wikipedia

   en.wikipedia.org/wiki/Serum-separating_tube

   These tubes should be used with care when measuring drug or hormone levels because the drug or hormone may diffuse from the serum into the gel, causing a reduction in measured level. The gel in SST II tubes (which appears slightly less opaque) is supposed [weasel words] to have less effect on drug levels in serum. [citation needed]

6. Vial - Wikipedia

   en.wikipedia.org/wiki/Vial

   Plastic vials, which can be moulded in plastic, can have other closure systems, such as 'hinge caps' which snap shut when pressed. These are sometimes called flip-tops or snap caps. The bottom of a vial is often flat, unlike test tubes, which have usually a rounded bottom, but this is often not the case for small hinge-cap or snap-top vials ...

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