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Test Code LAB743 Protein/Creatinine Ratio, Urine, Random

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

Creatinine: Enzymatic (Creatininase)

Protein: End point Assay: Colorimetric (Benzethonium Chloride)

Ratio (mg/g Creat): Calculation

Literature Reference:

Package Insert:

Creatinine CREP2 reagent.  Roche Corporation, 02/2019.

Total Protein Urine TPUC3.  Roche Corporation, 11/2018.

Specimen Requirements

Specimen Type: Urine, random

Container/Tube: Urine Complete Cup Kit

Specimen Volume: 10 mL

 

Collection Instructions: No additive.

Additional Information: See Urine Collection information under General Information.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: 2 to 4 hours after receipt in laboratory

Test Classification and CPT Coding

82570-Creatinine, urine

84156-Protein, urine

Reference Values

0 - 18 years: No established reference range

> 18 years: 0-180 mg / g CR

Note:

Calculated ratio above 180 mg/g CR with “<” result will flag as abnormal and will be reported as See Comment with a comment addition of “Unable to Calculate Exact Result.” 

Literature Reference:

Rifai N, Horvath AR, Wittwer AT eds: Textbook of Clinical Chemistry and Molecular Diagnostics 6th ed: Chapter 32, p. 479, Elsevier, St. Louis, MO 2018.

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only

Analyte Stability:

Specimen must be kept refrigerated during the collection and before delivery to limit bacterial growth.

Laboratory Processing Instructions:

Test performed in BJH Core Lab. Mix urine well. Using 13x100 test tubes, prepare a 7-mL aliquot and deliver to the automated line for centrifugation and delivery to Cobas 8000 for analysis. Completed specimen is stored refrigerated for 5 days.

Special Instructions

See Urine Collection information under General Information.

See Analyte Stability Chart under General Information for a complete list.

LOINC Code Information

Name LOINC Code
Creatinine/Protein in urine 16285-9