VACUETTE TUBE 6 ml NH Trace Elements Sodium Heparin 13x100 royal blue cap-black ring, non-ridged. Sold by the box of 50 each.

Features
Designed for testing of trace elements such as aluminum, lead, cadmium, chrome, iron, fluoride, cobalt, copper, lithium, manganese, molybdenum, mercury, selenium or thalium
Contains sodium heparin to activate antithrombins, thus blocking the coagulation cascade and producing a whole blood/ plasma sample instead of clotted blood plus serum
Manufactured from virtually unbreakable clear PET plastic Royal blue non-ridged pull caps with black exterior ring