UREA NITROGEN

Test Code

LAB140

CPT Codes
84520

Preferred Specimen

Green top/Gel Li Hep

Minimum Volume

2.0 mL

Other Acceptable Specimens

5.0 mL Gold SST

Transport Temperature

Refrigerated

Methodology
Colorimetric

Setup Schedule

Set Up:Daily Report Available:Routine 4 hr/ STAT 1hr

Reference Range

MALE:

0-5 years: 4-18 mg/dL

5-11 years: 5-19 mg/dL

> 11 years: 8-29 mg/dL

FEMALE:

0-14 years: 4-18 mg/dL

>15 years: 6-23 mg/dL

Clinical Significance

Measurements obtained by this test are used in the diagnosis of certain renal and metabolic diseases. The determination of serum urea nitrogen is the most 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.

Performing Laboratory
GBMC Chemistry

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.