UREA NITROGEN, URINE 24 HOUR
24 hour urine container, no preservative.
Refrigerate during collection. Measure total volume, transfer an aliquot to a clean urine container, record the volume on the container.
7 days refrigerated
Renal function test; coarse nitrogen-wasting test on patients on hyperalimentation; indicate nitrogen balance in hyperalimentation; rule out tap of urinary bladder in amniocentesis, paracentesis