0.5 mL (Note: This volume does not allow for repeat testing.)
Gel-barrier tube (send entire tube) is preferred. Red-top tube or green-top (heparin) tube is acceptable.
Draw blood in gel-barrier tube and centrifuge. If red-top tube or green-top tube is used, centrifuge within 45 minutes of draw, remove the serum or plasma, and place in a transport tube and tightly stopper the tube.
Patient should fast for 12 hours preceding collection of specimen.