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Test Code CA-24H Calcium, Urine 24 hr

Synonyms/Keywords

24 hour urine Calcium

Specimen Requirements

 

Fasting Required Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
No Urine, 24 hour 24 hr. Urine Jug with 7 grams Sulfamic Acid

24 hr. Urine Jug with 20 mL 6 N HCl

            or

 

 25 mL 33% Acetic Acid

 10 mL aliquot from a well mixer 24 hour urine 5 mL 2 mL

Collection/Processing Instructions

Indicate collection times. 

 

Total volume must be measured, recorded and included with the test request. 

 

If Uric Acid is also ordered, no preservative is needed, but specimen must be refrigerated throughout the collection and during transport. 

 

Prepare two aliquots, adjusting pH of calcium aliquot to 5 or less using 6N hydrochloric acid and the pH of a second (uric acid) aliquot to 7.5-8.5 using 20% sodium hydroxide.   Alternatively, use Marshfield preservative-containing aliquot tubes which provide automatic pH adjustment.

 

After measuring the total volume, create an aliquot and send the remaining urine in the collection jug to Marshfield; send both the aliquot and remaining urine in the collection jug.  

 

If a location is not able to measure the total volume, send the urine collection jug without making an aliquot. 

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerate 14 days

Interpretations

Low total Calcium (hypocalcemia) values are seen in osteomalacia, hypomagnesemia, vitamin D deficiency, hypoparathyroidism, steatorrhea, nephrosis, nephritis, and hepatocellular or renal parenchymal disease.

 

Elevated total Calcium (hypercalcemia) may be seen in: hyperparathyroidism, hypervitaminosis D, bone neoplasms, Milk-alkali syndrome (increased mild intake of calcium with antacids), sarcoidosis, thyrotoxicosis and polycemia vera.

Reference Range Information

Performing Location Reference Range
Marshfield 53-283 mg/24 hours

Marshfield Labs Performing Department

Marshfield Labs Chemistry

Performing Information

Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Marshfield Monday through Sunday Less than 2 hours Arsenazo III Endpoint Assay/Beckman AU 

CPT Codes

CPT Modifier
(if needed)		 Quantity Description Comments
82340        

Outreach CPT Codes

CPT Modifier
(if needed)		 Quantity Description Comments
82340        

Ordering Applications

Ordering Application Description
Cerner Calcium Level 24 Hour Urine