heparin tubes are coated on the inside wall with spray-dried lithium, ammonium or sodium heparin and are used to determine analytes in clinical chemistry. The additive acts as an anticoagulant, and blocks the clotting cascade.
heparin separator tubes contain an inert separator gel on the base of the tube which, after centrifugation, forms a stable barrier between the plasma and the blood cells. VACUETTE®
heparin tubes with separator gel improve the plasma yield and allow plasma to be stored in primary tubes.