Lab Dept:

Urine/Stool

Test Name:

CALCIUM/CREATININE RATIO, RANDOM URINE

General Information

Lab Order Codes:

CCRA

Synonyms:

Ca/Creat ratio, Random Urine

CPT Codes:

82340 – Calcium; urine quantitative, timed

82570 – Creatinine, other source

Test Includes:

Urine calcium in mg/dL, Urine creatinine in mg/dL, Calcium/creatinine ratio

Logistics

Test Indications:

The amount of calcium excreted into the urine is a measure of renal function, intestinal absorption, skeletal resorption, renal filtration and dietary intake.

Lab Testing Sections:

Chemistry

Phone Numbers:

Minneapolis:

Saint Paul:

612-813-6280

651-220-6550

Test Availability:

Daily, 24 hours

Turnaround Time:

1 day

Special Instructions:

1.0 mL minimum from a random urine collection. Refrigerate specimen during and after collection.

Specimen

Specimen Type:

Urine, random collection

Container:

Plastic leakproof container (No preservative)

Draw Volume:

2-4 mL from a random urine collection

Processed Volume:

Minimum: 1.0 mL urine

Collection:

A random urine sample may be obtained by voiding into a urine cup and is often performed at the laboratory. Make sure all specimens submitted to the laboratory are properly labeled with the patient’s name, medical record number and date of birth.

Special Processing:

Lab Staff: Acidify calcium aliquot before analysis to a pH of 1 - 2 with 6N HCL.

Patient Preparation:

None

Sample Rejection:

Unlabeled or mislabeled specimens

Interpretive

Reference Range:

There are no reference values established for random specimens.

Critical Values:

N/A

Limitations:

N/A

Methodology:

O-Cresolphthalein Complexone/Colorimetric; Alkaline Picrate/Kinetic

Contraindications:

N/A

References:

Tietz (1999) Clinical Guide to Laboratory Tests, 3^rd ed, Philadelphia, WB Saunders Company, pp 1404-1405

Dimension Calcium Flex Insert, P/N 717123.002 Rev I 6/00

Dimension Creatinine Flex Insert, P/N 717033.002 Rev G 10/99