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Test ID CACR3 Calcium/Creatinine Ratio, Random, Urine

Specimen Required

Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Collection Container/Tube: Clean, plastic urine container with no metal cap or glued insert

Submission Container/Tube: Plastic, 5-mL tube or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 4 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.

Useful For

Evaluation of calcium oxalate and calcium phosphate kidney stone risk


Calculation of urinary supersaturation


Evaluation of bone diseases, including osteoporosis and osteomalacia

Profile Information

Test ID Reporting Name Available Separately Always Performed
CCTR Calcium/Creat Ratio, Random, U No Yes
CALC5 Calcium, Random, U No Yes
CRETR Creatinine, Random, U No Yes

Method Name

CALC5: Photometric

CRETR: Enzymatic Colorimetric Assay

Reporting Name

Calcium/Creat Ratio, Random, U

Specimen Type


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 14 days
  Frozen  30 days
  Ambient  72 hours

Reference Values

1 month-<12 months: 0.03-0.81 mg/mg creat

12 months-<24 months: 0.03-0.56 mg/mg creat

24 months-<3 years: 0.02-0.50 mg/mg creat

3 years-<5 years: 0.02-0.41 mg/mg creat

5 years-<7 years: 0.01-0.30 mg/mg creat

7 years-<10 years: 0.01-0.25 mg/mg creat

10 years-<18 years: 0.01-0.24 mg/mg creat

18 years-83 years: 0.05-0.27 mg/mg creat

Reference values have not been established for patients who are less than 1 month of age.

Reference values have not been established for patients who are greater than 83 years of age.

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information



LOINC Code Information

Test ID Test Order Name Order LOINC Value
CACR3 Calcium/Creat Ratio, Random, U 9321-1


Result ID Test Result Name Result LOINC Value
CCTR Calcium/Creat Ratio, Random, U 9321-1
CALC5 Calcium, Random, U 17862-4
CRETR Creatinine, Random, U 2161-8

Day(s) Performed

Monday through Sunday

Report Available

1 to 3 days


If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.