Calcium, 24-Hour Urine with Creatinine

Calcium, 24-Hour Urine with Creatinine

Test Code

1635
82340, 82570
1635
82340, 82570
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to confirm Test Code for the lab that services your account or to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.

Clinical Significance

Calcium, 24-Hour Urine with Creatinine -

This quantitative test, performed with a 24-hour urine specimen, may help screen for hypercalciuria, one of the established risk factors for kidney stone formation [1-3]. This test may also help assess metabolic disorders of calcium metabolism, such as hyperparathyroidism, bone disease, and idiopathic hypercalciuria. In general, 24-hour urine specimens are preferred to random urine specimens when measuring calcium for diagnostic evaluation of hypercalciuria [1].

Calcium is essential for bone formation and nerve, muscle, and heart functions. Calcium metabolism is jointly regulated by parathyroid ...

Test Resources

Algorithm

Testing Algorithm for Hyperparathyroidism and/or Hypercalcemia

Clinical Focus

Autoimmune Rheumatic and Related Diseases

Clinical Focus

Parathyroid Dysfunction: Laboratory Testing for Diagnosis and Management

Test Details

Includes

  • CPT code 81050 may be added at an additional charge for volume measurement

Methodology

Spectrophotometry (SP)

Reference Range(s)

Unrestricted Calcium Diet

Male 55-300 mg/24 h
Female 35-250 mg/24 h
Restricted Calcium Diet
Male  55-200 mg/24 h 
Female 35-200 mg/24 h 

Calcium/Creatinine Ratio
Male 30-210 mg/g creat
Female 30-275 mg/g creat

Creatinine, 24-Hour Urine
<3 Years Not established
3-8 Years 0.10-0.80 g/24 h
9-12 Years 0.20-1.40 g/24 h
13-17 Years 0.40-1.90 g/24 h
>17 Years 0.50-2.15 g/24 h

LOINC® Codes, Performing Laboratory

Service Area must be determined
CPT code 81050 may be added at an additional charge for volume measurement

Methodology

Spectrophotometry (SP)

Reference Range(s)

Unrestricted Calcium Diet
Male 55-300 mg/24 h
Female 35-250 mg/24 h
Restricted Calcium Diet
Male  55-200 mg/24 h 
Female 35-200 mg/24 h 

Calcium/Creatinine Ratio
Male 30-210 mg/g creat
Female 30-275 mg/g creat

Creatinine, 24-Hour Urine
<3 Years Not established
3-8 Years 0.10-0.80 g/24 h
9-12 Years 0.20-1.40 g/24 h
13-17 Years 0.40-1.90 g/24 h
>17 Years 0.50-2.15 g/24 h
Service Area must be determined

Preferred Specimen(s)

10 mL aliquot of a well-mixed, 24-hour collection

Collection Instructions

Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH <2. Do not include first morning specimen; collect all subsequent voidings. The last specimen collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding.
Specify 24-hour total volume and collection duration on specimen container and test requisition.

Transport Container

Plastic screw-cap container

Transport Temperature

Room temperature

Setup Schedule, Alternative Specimen(s), Minimum Volume, Specimen Stability

Service Area must be determined
10 mL aliquot of a well-mixed, 24-hour collection
Refrigerate during and after collection. Collect urine with 25 mL of 6N HCl to maintain a pH <2. Do not include first morning specimen; collect all subsequent voidings. The last specimen collected should be the first morning specimen voided the following morning at the same time as the previous morning's first voiding.
Specify 24-hour total volume and collection duration on specimen container and test requisition.
Plastic screw-cap container
Room temperature
Service Area must be determined
Not offered in Quest Diagnostics Nichols Institute (IFD) – San Juan Capistrano. Please provide SERVICE AREA INFORMATION to confirm Test Code for the lab that services your account or to find available tests you can order.
In-home collection is not available in your area through Quest Mobile.
Test Details

Clinical Significance

Test Resources

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidance and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

This material contains content from LOINC® (http://loinc.org). The LOINC Table, LOINC Table Core are copyright © 1995-2019, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee and is available at no cost under the license at http://loinc.org/license.

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