Test Includes: Urea Nitrogen and the source and description of the fluid

CPT 4 Code: 84540

Test Order Mnemonic: UREA BF

Lab: Clinical Chemistry

Request Form: Write in on Routine Chemistry form 1

Storage Instructions: 2-8°C if not received in the lab within 4 hours after collection

Causes for Rejection: Specimen is too viscous for sampling

Availability: Samples are received 24 hours per day at Sample Management, Room 5.136 McCullough.

Turnaround Time: Routine: 24 hours; STAT: 1 hour

Special Instructions: List source of fluid on request form.

Specimen: Body fluids from all sources

Volume: 2 mL

Minimum Volume: 1 mL

Container: 10 mL plastic, conical, capped tube

Test Method: Colorimetric

Reviewed/revised April 2007 by P. Harris