10 mL (5 mL min.) aliquot of 24-hour Urine collected in an acid-washed (metal free) container kit available from TrueMedix. Mix thoroughly. Transfer 10 mL aliquot to vial provided in kit. Measure 24 hour total volume and record on vial and test request form. Ship refrigerated or frozen. Patient should avoid eating seafood at least 3 days prior to specimen collection. Use powderless gloves during specimen collection. Avoid catheterized urine specimen as rubber contains trace amounts of cadmium. If Gadolinium or Iodine containing contrast media has been administered, the specimen should not be collected for 96 hours.