Urine Calcium

Test Code

URCA

CPT Codes
82340

Includes

Random Specimen includes Urine Calcium. Timed Specimen includes Urine Volume, Hours Collected, Urine Calcium, and Calcium/Total Volume Ratio.

Preferred Specimen

Random or timed urine specimen.

Minimum Volume

1 mL

Instructions

Collect random specimen or timed specimen per orders. For Timed Specimens: Record stop and start time or number of hours on container. If transferring specimen from large urine jug to smaller urine cup, measure volume first and record on smaller container, along with start and stop time or number of hours. Timed specimens are typically collected for 24 hours, but can be collected in other increments, for example, 4 hours or 12 hours.

This test is for Calcium measurement on Urine. For Calcium measurement on Serum or Plasma, order CALCM. For Calcium measurement on Body Fluids, order MISCA.

Transport Container

24-hour urine container or sterile urine cup

Transport Temperature

Refrigeration

Specimen Stability

3 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Quantity Not Sufficient

Methodology
Colorimetric

Setup Schedule

Monday - Sunday, 8:00 am - 3:00 pm upon receipt

Report Available

Upon completion of analysis

Reference Range

Urine Volume: 800 - 1800 mL/24 hours
Calcium/Total Volume Ratio: 100 - 300 mg/24 hours

Clinical Significance

Urine Calcium measurement is useful for the identification of abnormal physiologic states causing excess or suppressed excretion of calcium (such as hyperparathyroidism), vitamin D abnormality, diseases that destroy bone, prostate cancer, and drug treatment (such as thiazide therapy).

Increased urinary excretion of calcium accompanies hyperparathyroidism, vitamin D intoxication, diseases that destroy bone (such as multiple myeloma), metastasis from prostatic cancer, and calcium supplementation.

Patients with absorptive hypercalciuria (increased gut absorption) will have lowered urine calcium with dietary restriction and, therefore, can be differentiated from patients with hypercalciuria caused by hyperparathyroidism, hyperthyroidism, Paget disease, or "renal leak" type of calciuria as seen in renal tubular acidosis.

Thiazide drugs tend to reduce excretion of calcium.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.