Urea Nitrogen, Fluid
Test Mnemonic
FLUN
CPT Codes
- 84540 - QTY (1)
LOINC ®
3093-2
Performing Laboratory
Cleveland Clinic Laboratories
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL | Fluid, body | Sterile container | Refrigerated | Viscous specimens will be rejected. Indicate source of fluid. |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 0.5 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 2 days |
| Refrigerated | 7 days |
| Frozen | Unacceptable |
Days Performed
Sun - Sat
Turnaround Time
8 hours
Methodology
| Name | Description |
|---|---|
| Urease |
Reference Range
| Urea Nitrogen, Fluid | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Refer to Clinical Information |
Special Info
Indicate body fluid type/source.
Clinical Info
Serous fluids: Urea Nitrogen measurement in peritoneal or drainage fluids is a useful test for detecting the presence of urine leaking through a defect in the urinary tract. A ratio of peritoneal drainage fluid urea nitrogen to a concurrent serum blood urea nitrogen > 1.0 indicates possible urine extravasation. Dialysate fluids: Urea Nitrogen measurement in dialysate fluid may be used in calculations to determine the adequacy of the dialysis regimen. The calculations are dependent upon various factors beyond the available laboratory data. References: 1. CLSI. Analysis of Body Fluids in Clinical Chemistry; Approved Guideline. CLSI document C49-A. Wayne, PA: Clinical Laboratory Standards Institute; 2007. 2. Wang J H, Kung, Y H, King, T M, et al. Measurement of peritoneal fluid urea nitrogen and creatinine levels is useful to detect iatrogenic urinary tract leakage in colorectal surgery. Journal of the Chinese Medical Association. 2015;78:283-286. 3. National Kidney Foundation. KDOQI Clinical Practice Guidelines and Clinical Practice Recommendations for 2006 Updates: Hemodialysis Adequacy, Peritoneal Dialysis Adequacy and Vascular Access. Am J Kidney Dis 48:S1-S322, 2006 (suppl 1).