Draw blood in either a dark blue no additive or a dark blue EDTA tube and discard. Draw blood in a second same type of dark blue tube, allow to clot in an upright position, centrifuge and transfer 2.0 mL serum/plasma to a serum or plasma trace element tube and send.
If drawing dark blue no additive transfer serum to a a serum trace element tube. If drawing a dark blue EDTA transfer plasma to a plasma trace element tube.