Active substance(s): calcium chloride dihydrate / magnesium chloride hexahydrate / malic acid / poly (0-2-hydroxyethyl) starch / potassium chloride / sodium acetate trihydrate / sodium chloridetetraspan 6% is an infusion solution which is administered via a cannulainto a vein.tetraspan 6% is a plasma volume substitute that is used to restore theblood volume when you have lost blood when other products calledcrystalloids are not considered sufficient alone.