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22399 Calcium, Urine 24 hr

Calcium, Urine 24 hr
Test Code: CA-24H
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 - see "Aliquotting of 24-Hour Urines for Multiple Tests".​
 
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​
Performing Laboratory 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 ​
Reference Range Information
Performing Location Reference Range
Marshfield​ 53-283 mg/24 hours​
Interpretation
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.
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82340​ ​ ​ ​ ​
Synonyms/Keywords
24 hour urine Calcium​
Ordering Applications
Ordering Application Description
​Centricity ​Calcium, 24Hr
​Cerner ​Calcium Level 24 Hour Urine
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
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
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 - see "Aliquotting of 24-Hour Urines for Multiple Tests".​
 
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​
Reference Range Information
Performing Location Reference Range
Marshfield​ 53-283 mg/24 hours​
Interpretation
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.
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Performing Laboratory 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 ​
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
82340​ ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.