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Urea Nitrogen Clearance, Plasma or Serum and Urine

Message
Plasma or serum and urine are required. Blood specimen should be drawn during 24-hour period of urine collection. Call CoxHealth Laboratories at 417-269-7820 at beginning of urine collection to ensure that a plasma or serum specimen is drawn.


Test Code
9689


CPT Codes
84545

Preferred Specimen


Plasma or serum and urine are required. 

Urine
Container/Tube: Plastic urine container(s)
Specimen Volume: 25 mL from a 12- or 24-hour urine collection
Collection Instructions: No preservative.
Note: 1. Starting and ending times of collection are required. 2. Follow instructions in Urine Collection in Special Instructions. 3. Indicate urine. 4. Label specimen appropriately (urine).  

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).
 




Transport Temperature
Refrigerate


Methodology
CoxHealth Laboratories-Chemistry

Setup Schedule
Monday through Sunday


Reference Range
41-68 mL/min


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.