CALCIUM CREATININE RATIO URINE

SIM

10655 

CPT

82340 and 82570 

Synonyms

Urine Ca/ Creat Ratio 

Specimen Type

Voided 24 hour Urine or a random urine  

Container

Sterile urine container and if needed a 24 hour urine container

Collection Instructions

•  If 24 hour collection collect all urine voided for 24 hours and place in the 24 hour urine container. 
•  The collection container is to be kept in the refrigerator or on ice during the timed period. 
•  Note the total number of hours and volume of urine collection on the aliquot for 24 hour urine sample.

Volume

Max: 5 ml preferred 
Min:  1 ml

Additional Information

•  Reported in mg per g Creatinine 
•  Calculation for the ratio = Urine Calcium / Urine Creat times 1000

Patient Preparation

None

Specimen Processing Instructions

• Refrigerate
• Note the number of hours of urine collection on the aliquot if 24 hour collection.
• Give aliquot to Core Lab so a tech can acidify with 2-3 drops of 6N HCL for the urine calcium.

Transport Requirements

Refrigerated

Specimen Stability

Refrigerated:  72 hours 

Rejection Criteria

Insufficient volume

Reference Range

No reference range for the ratio.  The ratio is reported in mg / g Creatinine.

Critical Value

None 

Test Includes

Urine Calcium,  Urine Creatinine,  Calculated Urine Calcium Creatinine ratio – Calculation for the ratio = Urine Calcium / Urine Creatinine times 1000.      

Methodology

Arzenazo for Calcium and Jaffe Rate method for Creatinine 

Testing Frequency

Daily, Monday - Sunday 

Reviewed By

Crystal Killian

Reviewed Date

3/17/2021

Supplemental

Both the 24 hour collection and the random collection, the ratio result is reported in mg / g of Creatinine.