A serum or plasma sample is typically used to test cholesterol levels. The sample is collected in a tube with no anticoagulant or a tube containing a gel separator to separate the serum or plasma from the cellular components after centrifugation.
A red top tube typically contains serum after the blood has been separated by centrifugation. Plasma is obtained from blood collected in tubes with anticoagulants.
The red top tube generally contains serum, which is the liquid portion of blood without clotting factors. Plasma, on the other hand, is obtained from blood collected in tubes with anticoagulants.
Red blood cells, serum, plasma
Creatine phosphokinase (CPK) is typically collected in a red-top tube for serum or a green-top tube for plasma.
FBS (fetal bovine serum) is typically collected in a red-top tube or a serum separator tube (SST) with a red-gray or gold-red-colored cap. Once collected, the tube is centrifuged to separate the serum from the blood cells.
Depends who you buy your red top tubes from, but mostly no. A serum seperator tube (SST) is usually yellow or gold top, it has a lump of clear gel in the bottom. When spun this gel ends up between the serum and red blood cellsmaking it easier to seperate the serum. A red top is generally a tube with nothing at all in it. So when spun you end up with serum and clotted red cells but nothing seperating them. Most other colour tubes contain an anti coagulant preventing the blood from clotting so when spun you end up with plasma and red cells. The important thing for most tests is the difference between serum and plasma, so a red top and an SST can generally be used for the same tests although SST is often prefered as its easier to work with.
serum
A red-top tube typically contains no anticoagulant. It is used for serum samples where blood is allowed to clot before being centrifuged to separate the serum.
A serum tube, typically a red-top tube, is used to draw blood for a chemistry panel. It is important to allow the blood to clot before centrifuging to separate the serum for testing.
red tube
Green top tube ( lithium or sodium heparin) for plasma CMP; or Red top/SST for CMP, serum