Tube type Cap Colour Ring Colour Tube Contents
1.8 mL sodium citrate tube Translucent blue Buffered sodium citrate

1.8 mL 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