Urine-BUN

CPT Code

84540

Specimen Type

Urine

Container Type

Sterile Specimen Container

Stability

Room Temperature, 2 days; 2-8° C, 7 days; – 20°C, 1 month

Handling Instructions

Collect in Sterile Specimen Container, No Preservatives

Clinical Notes

Measurements obtained by this test are used in the diagnosis of certain renal and metabolic diseases. The determination of serum urea nitrogen is a widely used test for the evaluation of kidney function. The test is frequently requested in conjunction with the serum creatinine test for the differential diagnosis of prerenal (cardiac decompensation, water depletion, increased protein catabolism), renal (glomerulonephritis, chronic nephritis, polycystic kidney, nephrosclerosis, tubular necrosis), and postrenal (obstructions of the urinary tract) hyperuremia.