1 mL whole blood in a royal blue trace metal-free tube with
EDTA. Refrigerate.
Diet, medication, and nutritional supplements may introduce
interfering substances. Patients should be encouraged to
avoid shellfish and seafood for 48-72 hours and discontinue
nutritional supplements, vitamins, minerals, and
non-essential over-the-counter medications (upon the advice
of their physician) for 1 week prior to collection.
Avoid exposure to contrast media for 96 hours prior to
collection.