BUN (UREA NITROGEN)

BUN

2-8 C (ice packs)

store at 2-8 C up to 7 days, -20C up to 1 year

0.5 mL

Plasma (lithium heparin or sodium heparin)

<50 years of age: Male 8.9-20.6 mg/dL Female 7.0-18.7 mg/dL >50 years of age: Male 8.4-25.7 mg/dL Female 9.8-20.1 mg/dL

Routine venipuncture

Draw tube or plastic pour off tube

Urease

evaluation of kidney function, requested in conjuction with creatinine for the differential diagnosis of prerenal(cardiac decompensation, water depletion, increased protein catabolism), renal (glomerulonephritis, chronic nephritis, polycystic kidney, nephrosclerosis, tubular necrosis), and postrenal (onstructions of the urinary tract) hyperuremia.

Urea Nitrogen