Tube type Cap Colour Ring Colour Tube Contents
3 mL sodium citrate tube Blue Black Buffered sodium citrate

3ml sodium citrate tube


Must be filled to the level of the arrow. Short samples give invalid results.

Label the specimen with:

  • Surname
  • Forename
  • Date of birth (not age) OR unique identity number (MRN number, NHS number)

For further information, see: Pathology policy for specimen and request form labelling for pathology users