Sign in →

Test Code CACR1 Calcium, Random, Urine

Useful For

Evaluation of calcium oxalate and calcium phosphate kidney stone risk, and calculation of urinary supersaturations


Evaluation of bone diseases, including osteoporosis and osteomalacia

Method Name

Photometric, NM-BAPTA Reaction

Reporting Name

Calcium, Random, U

Specimen Type


Specimen Required

Collection Container/Tube: Plastic urine container

Submission Container/Tube: Plastic, 5-mL tube (T465) 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.

Specimen Minimum Volume

1 mL

Specimen Stability Information

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

Reject Due To

All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.

Reference Values

Random Calcium/Creatinine Ratio: <0.20 mg/mg


Reference values have not been established for patients <18 years and >83 years of age.

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test has been modified from the manufacturer’s instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
CACR1 Calcium, Random, U 17862-4


Result ID Test Result Name Result LOINC Value
CALC5 Calcium, Random, U 17862-4
CREA7 Creatinine Concentration 2161-8
CCTR Calcium/Creatinine Ratio 9321-1


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