Whole Blood: 2 mL(0.6 mL)-Fluoride oxalate (gray-top)
Urine: 5 mL(1 mL)-Fluoride oxalate (gray top)

PLEASE READ ALL INSTRUCTIONS BEFORE STARTING THE COLLECTION!

If additional tests are ordered, please submit a separate specimen

1.) At the start of the test, have the patient empty the bladder completely and discard the urine. Some physicians recommend checking a fasting urine and/or a blood sample for non-specific interferences. If requested, retain an aliquot of the urine and collect a blood specimen at this time.

2.) Give 25 grams of D(+)-xylose (or 5 grams if so specified by the physician) dissolved in 250 mL water followed immediately by an additional 250 mL water to ensure a urine flow of at least 60 mL/hour. For children, give 0.5 g xylose/kg of body weight up to 25 g, reducing the amount of water accordingly.

3.) NOTE AND RECORD STARTING TIME OF THE TEST AND THE AMOUNT OF XYLOSE GIVEN.

4.) Collect a Whole blood specimen at 2 hours after the start of the test. 

5.) Collect all urine specimens voided during the next 5-hour period, including the final 5-hour void in the same container. Keep container refrigerated during collection.

6.) Mix total urine collection thoroughly, measure Total Volume and aliquot. Aliquot urine into an empty gray-top blood collection tube. The oxalate/fluoride will serve as a preservative for the urine. (If gray-top tube is glass, please transfer the preserved urine aliquot to a plastic tube before shipping. Please mark Plastic Aliquot tube of contents, ie: 5mL oxalate preserved urine.