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Test Code LAB4342 UREA NITROGEN, URINE, 24 HOUR

Important Note

- Add a 10g Boric Acid tablets (Four 2.5g tablets) prior to collection. 

- Record collection time and total volume.

 

Specimen Type

24-hour urine collection with 10g Boric Acid preservative added prior to collection.

Collection Instructions

Collect 24 hour urine sample into container with Boric Acid Preservative. Refrigerate during collection.

Specimen Volume

50 mL

Minimum Volume

2 mL

Turnaround Time

STAT: 1 Hour
Routine: 4 hours

Test Schedule

Daily

Sample Stability

Room Temp: 2 days
Refrigerated: 7days
Frozen: 1 month

Specimen Processing

Invert 24 hour urine container several times to mix the specimen.
Aliquot 50 mL of a well-mixed 24-hour urine collection into a leakproof plastic urine container.
Aliquot 5 mL into a transparent red top tube
Record collection time and total volume.
Freeze 50ml Specimen Aliquot.

Method

Colormetric

Test Components

Time, h; Volume, mL; Urea Nitrogen, Urine, mg/24h.

CPT Codes

84540

Rejection Criteria

 Mislabeled or unlabeled specimen; Incomplete 24 hour urine sample collections (See 24 hour Urine Collection instructions); Specimen contaminated with fecal material.