Test Name

 Calcium urine
(random)

Test
Codes

2621

Unit

mg/dL

Station

Chemistry

Synonym
Name/Abbreviation

Ca,
urine

CPT
Code

82340

Performing
Facility

American
Medical Labs, Herzliya Pituah

Analyzer

Roche cobas 6000

Test
Method

Colorimetric
assay

AML
preferred tube/ container

Routine
urinalysis leakproof tube or container, BD urine transport tube, or
sterile urine cup.

Sample
collection

 Collect urine in a screw-cup
plastic container or transfer it to a random urine transport tube. Screw
the lid on securely. Transport the specimen promptly to the laboratory.

Storage
Instructions

Refrigerated.

Stability:

48h
15-25 ^oC

4
days 2-8 ^oC

3
weeks -15to -25 ^oC

Min.
Volume

10 mL

Comments

Urinary
calcium reflects in part the relation between GFR and tubular
reabsorption. A random urine calcium-to-creatinine ratio is used to screen
for hypercalciuria, as it is found to have a good correlation with 24-hour
urine calcium excretion.
Increased urinary excretion of calcium accompanies
hyperparathyroidism, vitamin D intoxication, diseases that destroy bone
(such as multiple myeloma), metastasis from prostatic cancer, and
following calcium supplementation. Urine calcium is increased with
immobilization, with steroid therapy, with Paget disease, and in primary
(idiopathic) hypercalciuria.

Turn-Around-Time

One day

Intended
Use

Urine
calcium determinations are used to investigate effects of vitamin D, and
parathyroid hormone. The results reflect intake, rates of intestinal
calcium absorption, bone resorption and renal loss.

Limitations

Decreased
in patients on oral contraceptives. Lacks specificity for
hyperparathyroidism (HPT) when increased. Five percent of the population
has hypercalciuria.

 Measuring range: 0.8-30.1 mg/dL

Patient
Preparation

No
patient preparation
needed

Reasons
for Rejection

Quantity
not sufficient for analysis; improper labeling; improper tubes; specimen
more than 48 hours old if nonrefrigerated.

Adult
Reference Ranges

6.8
– 21.3 mg/dL