Zinc, 24-Hour Urine
Mayo: ZNU, EPIC: LAB6857, Beaker: XZINU
- Please refer to the Specimen Collection Manual for instructions on 24 Hour Urine Collection:
High concentrations of barium are known to interfere with this test. If barium-containing contrast media has been administered, a specimen should not be collected for 96 hours.
Specimen Collection Criteria
Collect (preferred specimen): 24-hour urine sample with no preservative.
Keep 24 hour urine specimen iced or refrigerated during collection.
- Include start and end dates and times for the collection period on the specimen container.
Urine Preservative Options
6N Hydrochloric Acid
Boric Acid (10g)
50% Acetic Acid
Physician Office/Draw Specimen Preparation
Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.
Preparation for Courier Transport
Transport: Entire 24-hour urine collection, refrigerated (2-8°C or 36-46°F).
Random urine specimens.
Specimens not collected and processed as indicated.
Measure total volume of 24-hour urine specimen. Record total volume and collection start and end dates and times in the LIS system. Aliquot 8.0 mL from the well-mixed 24-hour urine collection into a metal-free transport tube. (Minimum: 0.5 mL)
Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 28 days
Refrigerated (2-8°C or 36-46°F): 28 days
Frozen (-20°C/-4°F or below): 28 days
Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.
Sent to Mayo Clinic Laboratories in Rochester, MN.
Results available in 2-7 days.
Quantitative Inductively Coupled Plasma/Mass Spectrometry.
Zinc is predominantly eliminated in the feces. Elevated urine zinc may suggest excessive zinc supplementation but should be interpreted with a corresponding serum zinc concentration.
Send Out Laboratory – RO
Microtainer® and Vacutainer® are registered trademarks of Becton, Dickinson and Company.
UroVysion® is a registered trademark of Abbott Laboratories. ThinPrep® is a registered trademark of Hologic, Incorporated.
This directory currently reflects information only for specimens collected and/or processed at the
Farmington Hills, Grosse Pointe, Royal Oak, and Troy campuses.