The page below is a sample from the MediaLab course, Phlebotomy
Learn about Compliance & CE courses available for clinical laboratories
and individual medical technologists
- Blood may be collected into either:
- Red top (clot) tubes.
- Speckle top tubes (serum separator tube).
- Gray top tubes specifically designed to preserve glucose levels.
- Gray top tubes contain additives such as sodium fluoride or potassium oxalate, which prevent metabolism of glucose by blood cells.