Urea Nitrogen, Urine 24 hour 
Mnemonic U UN T
CPT 84540
Test Code 1001226
Synonyms  
Test Includes  
Specimen Urine (24 Hour)
Volume 5.0 mL
Container Plastic Urine Container (24 Hour)
Special Instructions  
Specimen Prep No preservatives required. Refrigerate specimen throughout collection and maintain refrigerated until tested.
Storage Refrigerate
Transport Temp Refrigerated
Stability Rm Temp 48 hours
Stability Refrig 7 days
Stability Frozen 1 month
Methodology Urease/GLDH
Rejection Criteria   
Reference Value 12 - 20 g/24 hour 
Performed/TAT Monday - Sunday        
Comments Note 24 hour volume. Total volume performed and charged as needed.