Lab Test

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

Last Updated

5/5/2021

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