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BLOOD UREA NITROGEN
MessageCHEMISTRY
Test Code
BUN
Alias/See Also
BUN, UREA NITROGEN
Preferred Specimen
PLASMA
Minimum Volume
1-2 MLS
Other Acceptable Specimens
SERUM
Instructions
DRAW 1 LT GREEN LITHIUM HEPARIN TUBE, MIX WELL AND SPIN, SEND TO LAB REFRIGERATED.
Transport Container
ORIGINAL TUBE
Transport Temperature
2-8 c 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
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Unlabeled sample, improper temperature during transport. Wrong sample collection. Sample unspun before transport.
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.
Measurements obtained by this test are used in the diagnosis of certain renal and metabolic diseases.
Measurements obtained by this test are used in the diagnosis of certain renal and metabolic diseases.
Performing Laboratory
WHITE RIVER JUNCTION VT VA- CHEMISTRY 802-295-9363 EXT: 5518, 5519
