Test Directory

BUN

Loinc

Expected Turnaround

24 hours

Information

Determination of blood urea nitrogen is the most widely used screening test for renal function. When used in conjunction with serum creatinine determinations it can aid in the differential diagnosis of the three types of azotemia: prerenal, renal and postrenal.

Collection Information

Methodology

Urease/Glutamate dehydrogenase (GLDH)

Limitations

Rejection Criteria

Specimen Stability

Room Temperature: 7 days Refrigerated: 7 days Frozen: 1 year

Alias

BUN; Blood urea nitrogen; Urea nitrogen; Urea

Container Type

Serum, gel separator, SST

Minimum Volume

1 ML

Age Range

18 - 60

Sex

Generic

Units of Measure

mg/dL

Reference Range

6 mg/dL - 20 mg/dL

Panic Range