Test Code UTPCRR Total Protein Creatinine Ratio Urine, Random LAB743
Test Method
Protein: Dye-Binding Colorimetric Method; Beckman DXC600
Creatinine: Jaffe Rate; Beckman
Performance
Testing is performed Monday through Sunday
Typically completed the same day the specimen arrives at the
testing site.
Useful For
The total protein to creatinine ratio estimates the degree
of
proteinuria based on a single random urine collection.
Increased
amounts of protein in the urine may be seen with glomerular
disease, over-flow proteinuria, urinary tract inflammation and
urinary tract neoplasm. While the total protein/creatinine
ratio
can be used for screening or monitoring proteinuria in certain
clinical situations, the 24 hour urine total collection remains
the
test of choice to measure true proteinuria.
Specimen Requirement
2 mL urine is required.
CPT Code Information
84156 Chemistry: Protein, total, except by refractometry,
urine
82570 Chemistry: Creatinine; other source
Reference Values
<0.2
Reference value not established for children <2 years of
age.
LOINC Code Information
2890-2 Protein/Creatinine [Mass Ratio] In Urine
Additional Specimen Collection Information
Random urine specimens should be collected in a plastic
container. No preservative required. Label the specimen
appropriately with two identifiers, patient name and another
identifier, (patient ID number, DOB, etc.) include date and time
of
collection. Urine specimens should be assayed within two
hours
of collection. If a urine cannot be run within two hours store
refrigerated for up to 72 hours. Frozen samples are not
acceptable.
Do not place specimen in a glass container. Do not collect
specimens from patients with a urinary tract infection. Urine
should not be collected during periods of exercise or prolonged
upright posture. Avoid hematuria or blood contamination.