Sign in →

Test Code CALU Calcium, 24 Hour, Urine

Useful For

Evaluation of calcium oxalate and calcium phosphate kidney stone risk, and calculation of urinary supersaturations

 

Evaluation of bone diseases, including osteoporosis and osteomalacia

Method Name

Photometric, NM-BAPTA Reaction

Reporting Name

Calcium, 24 Hr, U

Specimen Type

Urine


Specimen Required


Collection Container/Tube: 24-hour graduated urine container with no metal cap or glued insert

Submission Container/Tube: Plastic, 5-mL tube (T465) or a clean, plastic aliquot container with no metal cap or glued insert

Specimen Volume: 4 mL

Collection Instructions:

1. Collect urine for 24 hours.

2. Refrigerate specimen within 4 hours of completion of 24-hour collection.

Additional Information:

1. 24-Hour volume is required.

2. See Urine Preservatives in Special Instructions for multiple collections.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Reject Due To

Hemolysis

NA

Lipemia

NA

Icterus

NA

Other

NA

Reference Values

Males: <250 mg/24 hours

Females: <200 mg/24 hours

 

Reference values have not been established for patients <18 years and >83 years of age.

Reference values apply to 24-hour collection.

Day(s) and Time(s) Performed

Monday through Sunday; Continuously.

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements.

CPT Code Information

82340

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CALU Calcium, 24 Hr, U 6874-2

 

Result ID Test Result Name Result LOINC Value
CA24 Calcium, 24 Hr, U 6874-2
TM114 Collection Duration 13362-9
VL110 Urine Volume 3167-4
CACN Calcium Concentration In Process

Urine Preservative Collection Options

Ambient

Yes

Refrigerated

Preferred

Frozen

Yes

6N HCl

Yes

50% Acetic Acid

Yes

Na2CO3

No

Toluene

Yes

6N HNO3

Yes

Boric Acid

Yes

Thymol

Yes