A B C D E F G H I J K L M N O P Q R S T U V W X Y Z #

Fractional Urea Excretion (FEUN), Plasma or Serum and Urine

Message


Call CoxHealth Laboratories at 417-269-7820 at beginning of urine collection to ensure that a plasma or serum specimen is drawn  




Test Code
6124


CPT Codes
82565-Creatinine, plasma or serum; 82570-Creatinine, urine; 84520-Urea, plasma or serum; 84540-Urea, urine

Preferred Specimen


Plasma or serum and urine are required.  
Blood specimen should be drawn during 24-hour period of urine collection. 

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 on request form. 2. Label specimen appropriately (serum).

Urine (Random Preferred):
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).

Alternate: 24 hr urine:
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. Indicate urine. 4. Label specimen appropriately (urine).

 




Instructions
Urine Collection


Transport Temperature
Refrigerate


Methodology
Urease/Glutamate Dehydrogenase

Setup Schedule
Monday through Sunday


Reference Range
A FEUN < 35% is suggestive of a prerenal etiology of acute renal failure, while a FEUN > 50% suggests acute tubular necrosis.


Clinical Significance
Useful for differentiating pre-renal failure and acute tubular necrosis.  


Performed By
CoxHealth



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.