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UREA NITROGEN
MessageCHEMISTRY
Test Code
UREA NITROGEN
Alias/See Also
BUN, BLOOD UREA NITROGEN, UREA NITROGEN-BLOOD, UUN
Preferred Specimen
PLASMA, RANDOM URINE, 24 HR URINE
Instructions
BLOOD:DRAW 1 LI HEP (LIGHT) GREEN TOP TUBE, SPIN DOWN AND SEND TO LAB. RANDOM URINE:COLLECT RANDOM URINE SAMPLE AND SEND TO LAB. 24HR URINE: GIVE PT 24HR JUG FOR COLLECTION. FIRST MORNING URINE OF START OF 24 HR, VOID IN THE TOILET AS NORMAL. EVERY URINE AFTER THAT INCLUDING THE FIRST MORNING URINE OF THE SECOND MORNING GOES INTO THE JUG. NOTE TIME WHEN STARTED AND WHEN FINISHED. MUST BE KEPT REFRIGERATED WHEN NOT URINATING INTO JUG. BRING BACK TO LAB AFTER COLLECTION IS OVER.
Transport Container
BLOOD: ORIGINAL CONTAINER, RANDOM URINE: STERILE CONTAINER: YELLOW BD URINE TUBE, 24 HR URINE: 24 HR JUG PROVIDED BY LAB.
Transport Temperature
REFRIGERATED
Specimen Stability
Room temperature: 7 days
Refrigerated (2-8°C): 7 days
Frozen (-20°C or colder): 1 year
Refrigerated (2-8°C): 7 days
Frozen (-20°C or colder): 1 year
Methodology
UREASE
Setup Schedule
DAILY
Report Available
DAILY
Reference Range
7-25 mg/dL
Clinical Significance
Urea is the principle waste product of protein catabolism. BUN is most commonly measured in the diagnosis and treatment of certain renal and metabolic diseases. Increased BUN concentration may result from increased production of urea, due to (1) diet or excessive destruction of cellular proteins as occurs in massive infection and fevers; (2) reduced renal perfusion resulting from dehydration or heart failure; (3) nearly all types of kidney disease, and (4) mechanical obstruction to urine excretion such as is caused by stones, tumors, infection, or stricture. Decreased urea levels are less frequent and occurs primarily in advanced liver disease and in overhydration.
Performing Laboratory
WHITE RIVER JUNCTION VT VA- CHEMISTRY 802-295-9363 EXT: 5518, 5519
