Tubes

Lithium heparine
- in The Netherlands: green cap, in Belgium: orange
- mainly for clinical chemistry: cholesterol, hormones, etc.

EDTA
- in The Netherlands: purple, in Belgium: rood
- EDTA maintains the cellular integrity
- so, it is used for the morphology of red blood cells, leukocytes

Serum
- in the Netherlands: red, in Belgium: white
- without anticoagulans, serum is retained
- so for serology

Citraat
- in the Netherlands: blue, in Belgium: green
- for coagulation