Calcium Creatinine Ratio, Urine
Urine Calcium/Creatinine Ratio, Calcium/Creatinine Ratio, Urine
Test Codes
Antrim #19028, EPIC: LAB5437, CACRR
Department
Chemistry
Specimen Collection Criteria
Collect (preferred specimen): Random urine specimen in a screw-capped container (preferred) or other sterile collection cup. (Minimum: 5.0 mL)
- Refer to the table of Urine Preservative Options when multiple tests are requested.
- Include start and end dates and times for the collection period on the specimen container.
Physician Office/Draw Specimen Preparation
Maintain specimens refrigerated (2-8°C or 36-46°F) prior to transport.
Preparation for Courier Transport
Transport: Random urine, refrigerated (2-8°C or 36-46°F).
Rejection Criteria
Urines collected with Acetic Acid or Sodium Carbonate.
Specimens not collected and processed as indicated.
In-Lab Processing
Aliquot a minimum of 5.0 mL from the random urine.
Storage
Specimen Stability for Testing:
Room temperature (20-26°C or 68-78.8°F): 4 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): For longer storage.
Specimen Storage in Department Prior to Disposal:
Refrigerated (2-8°C or 36-46°F): 7 days
Laboratory
Dearborn Chemistry Laboratory
Famington Hills Chemistry Laboratory
Grosse Pointe Chemistry Laboratory
Royal Oak Automated Chemistry Laboratory
Troy Chemistry Laboratory
Performed
Sunday – Saturday, 24 hours a day.
Results available within 24 hours of receipt in the Laboratory.
Reference Range
0.02-0.26 (both calcium and creatinine reported as mg/mg creatinine).
Test Methodology
Spectrophotometry.
Interpretation
This assay includes a Urine Calcium and a Urine Creatinine assay.
Clinical Utility
The urine calcium/creatinine ratio is useful as a screening test to assess the presence or absence of hypercalciuria. Ideally a 24 hour urine for calcium is the best indicator of this condition, but a random urine is more convenient for patients, especially children. Results greater than 0.26 suggest hypercalciuria.
CPT Codes
82340, 82570.
LOINC: 44716-9
Contacts
Chemistry Laboratory – DBN
313-596-2196
Name: Chemistry Laboratory – DBN
Location:
Phone: 313-596-2196
Chemistry Laboratory – FH
947-521-5252
Name: Chemistry Laboratory – FH
Location:
Phone: 947-521-5252
Automated Chemistry Laboratory – RO
248-551-8065
Name: Automated Chemistry Laboratory – RO
Location:
Phone: 248-551-8065
Chemistry Laboratory – TR
248-964-8070
Name: Chemistry Laboratory – TR
Location:
Phone: 248-964-8070
Chemistry Laboratory – GP
313-473-1807
Name: Chemistry Laboratory – GP
Location:
Phone: 313-473-1807
Last Updated
5/5/2021
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