For venous blood specimens, if it is test tubes used in blood collection that you are referring to, the gel is a serum separator. When the sample is centrifuged, the red cells will spin to the bottom, plasma to the top, gel separating the blood components.
You can send red tubes off to be tested. These tubes are used to collect blood and seamen.
The Red/Gray color tubes have serum in the serum separating tubes.
The only lab that is centrifuged is the capsule for training pilots and astronauts to handle high "G" forces.
When a tube of blood is centrifuged, erythrocytes end up on the bottom of the tube.
Name the three layers in centrifuged blood. erythrocytes, the Buffy coat, and plasma
The Red/Gray color tubes usually have serum in them.
The tubes used when having blood drawn serve more than one purpose. Obviously, something needs to hold the blood after it is collected. Each tube is a different color, so that different types of tests can be done. Tubes are colored differently to identify the different additives in them, and to also allow an easier time identifying the different departments that they must go to for testing. The tubes in the draw are different colors because they have differerent anticogulates in them, which is basically just a big word for how long it takes the blood to clot. Some tests require a different amount of anticogulates. A plain red tube for example cannot have any anticogulates because that's the tube you draw when your doing a blood type or crossmatch and you can't have anything to interfere with the test. Tubes have to clot before they can be centrifuged (spun down) and after they are centrifuged you can run the test on the blood. So if it is a stat order its best to get a tube with the most anticogulate so you don't have to wait as long for the blood to clot so you can run the test.
Non additive red tube
yes. Blood separates into, from top to bottom, plasma, white blood cells/ platelets, and red blood cells.
Centrifuged.
you can have any color but red... and the tubes can't be visible you can have any color but red... and the tubes can't be visible