Nitrogen, Total, Urine

Abbrev Code:MMMISC   
Order Code:LAB4909Order Name:Nitrogen, Total, Urine
Methodology:Dumas combustion
CPT Codes: 84999 x1
Turnaround Time:Specimens are sent to reference laboratory Mon-Fri; results are reported within 1-5 days.

This test was developed and its performance characteristics determined by Laboratory Medicine and Pathology, Mayo Clinic. This test has not been cleared by the U.S. Food and Drug Administration.

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Urine Collection Procedure

Collection Instructions

Specimen:Urine, 24 hour collection
Optimal Volume:Submit entire 24 hour collection; analysis requires 2 mL.
Container:3 L plastic jug
Collection Instructions:Refrigerate during collection.

Processing and Shipping

Specimen Processing:Mix collection well before aliquot is taken. Aliquot 10 mL, 2 mL minimum, into two transport tubes. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Test Performed at or Referral Lab Lab Sendouts  (Mayo)
Referral Lab number:NITU


Reference Range:16 years of age and older: 4-20 g/24hours. A reference range for patients under 16 years of age has not been established by the reference laboratory.
Use:Measure of protein catabolism; monitor total parenteral nutrition.

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