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Urea Nitrogen (BUN), Plasma, Serum, or Urine
Test Code1280
CPT Codes
84520-Plasma or serum (if appropriate); 84540-Urine (if appropriate)
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate serum. 2. Label specimen appropriately (serum).
Urine, 24-Hour Collection
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a 24-hour urine collection
Collection Instructions: No preservative.
Note: 1. 24-Hour volume is required. 2. Follow instructions in Urine Collection in Special Instructions. 3. Label specimen appropriately (24-hour urine).
Urine, Random
Collection Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a random urine collection
Collection Instructions: No preservative.
Note: 1. Indicate random urine. 2. Label specimen appropriately (random urine).
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate plasma. 2. Label specimen appropriately (plasma).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum
Collection Instructions: Avoid hemolysis.
Note: 1. Indicate serum. 2. Label specimen appropriately (serum).
Urine, 24-Hour Collection
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a 24-hour urine collection
Collection Instructions: No preservative.
Note: 1. 24-Hour volume is required. 2. Follow instructions in Urine Collection in Special Instructions. 3. Label specimen appropriately (24-hour urine).
Urine, Random
Collection Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a random urine collection
Collection Instructions: No preservative.
Note: 1. Indicate random urine. 2. Label specimen appropriately (random urine).
Instructions
Urine Collection
Transport Temperature
Refrigerate
Methodology
Urease/Glutamate Dehydrogenase
Setup Schedule
Monday through Sunday
Reference Range
PLASMA OR SERUM
1-30 days: 4-12 mg/dL
31 days-2 years: 2-14 mg/dL
3-8 years: 3-16 mg/dL
>=9 years: 7-18 mg/dL
URINE
7-20 g/24 hours
1-30 days: 4-12 mg/dL
31 days-2 years: 2-14 mg/dL
3-8 years: 3-16 mg/dL
>=9 years: 7-18 mg/dL
URINE
7-20 g/24 hours
Clinical Significance
Useful as a renal function test.
Performed By
CoxHealth
