Phlebotomy tubes with light blue stoppers primarily contain two additives: sodium citrate (3.2% or 3.8%) and Citrate, theophylline, adenosine, dipyridamole) or CTAD. The citrate acts as an ...

Each specimen tube or sample collection container must ... otherwise the anticoagulant or other additive concentration will not be appropriate for the sample. The patient’s hydration state ...