Some of the tubes have special ingredients in them that mix with the blood to preserve it others do not. The lab tech has a sheet which tells them which blood tests are run from which tube.
Asked in Health, Medication and Drugs
Do a blue top tube contains the anticoagulant lithium heparin?
The colors mean different things in different countries. If you want a correct (reliable)answer, try again with the specification of your country. Green Top tubes contain Lithium Heparin. Blue top tubes contain Sodium Citrate. ...
What does different colors mean to different cultures?
Different colors mean different things to cultures. For instance white is commonly used as a symbol of purity, red a symbol of love and black a symbol of darkness or evil among others. ...