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HomeLab Services GuideTests
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Overview
ข้อมูลทั่วไป Specimen
ข้อมูลสิ่งส่งตรวจ Performance
ข้อมูลการทดสอบ Clinical & Interpretation
ข้อมูลทางคลินิก
 
Test Code (รหัสการทดสอบ):
CAU
Order Name (ชื่อการทดสอบ):
Calcium, Random Urine
 
Specimen / Container (สิ่งส่งตรวจ/ภาชนะ):
Urine, Clean container 
 
Turnaround Time (ระยะเวลารอผล):
Collected specimen to report within 90 min
 
Useful For (ประโยชน์การทดสอบ):
  1. Evaluation of calcium oxalate and calcium phosphate kidney stone risk, and calculation of urinary supersaturations.
  2. Evaluation of bone diseases, including osteoporosis and osteomalacia.
 
Methodology (วิธีการทดสอบ):
Arsenazo III
 
AliasesName (ชื่อเรียกอื่นๆ) :
Ca (Calcium), Random urine
 
 
 
Test Code (รหัสการทดสอบ):
CAU
Order Name (ชื่อการทดสอบ):
Calcium, Random Urine
 
Collection Specimen Or Container (สิ่งส่งตรวจ/ภาชนะ):
Urine, Clean container 
 
Specimen Testing Type (สิ่งส่งตรวจที่ใช้ในการทดสอบ):
Urine, minimum volume 10 mL
 
Sub Mission Container (ภาชนะส่งตรวจ):
Clean container
 
Specimen Stabillity (ความคงตัวของสิ่งส่งตรวจ):
Specimen Type Temperature Time
Random urine Refrigerated, 2oC to 8oC 4 days
Frozen, -20oC 21 days
 
 
 
Test Code (รหัสการทดสอบ):
CAU
Order Name (ชื่อการทดสอบ):
Calcium, Random Urine
 
Method detail (วิธีการทดสอบ):
Arsenazo III
 
Schedule (ตารางการทดสอบ):
Tested daily (24 hours)
 
Turnaround Time (ระยะเวลารอผล):
Collected specimen to report within 90 min
 
Performing Location (หน่วยงานที่ทำการทดสอบ):
Chemistry, Laboratory Department Tel. 13224
 
Specimen Retention Time (ระยะเวลาเก็บสิ่งส่งตรวจ):
7 days
 
 
 
Test Code (รหัสการทดสอบ):
CAU
Order Name (ชื่อการทดสอบ):
Calcium, Random Urine
 
 
Clinical Information (ข้อมูลทางคลินิก):
Calcium is the fifth most common element in the body. It is a fundamental element necessary to form electrical gradients across membranes, an essential cofactor for many enzymes, and the main constituent in bone. Under normal physiologic conditions, the concentration of calcium in serum and in cells is tightly controlled. Calcium is excreted in both urine and feces. Ordinarily about 20% to 25% of dietary calcium is absorbed and 98% of filtered calcium is reabsorbed in the kidney. Traffic of calcium between the gastrointestinal tract, bone, and kidney is tightly controlled by a complex regulatory system that includes vitamin D and parathyroid hormone. Sufficient bioavailable calcium is essential for bone health. Excessive excretion of calcium in the urine is a common contributor to kidney stone risk.
 
Reference Value (ค่าอ้างอิง):
5 – 17.5 mg/dL
 
Interpretation (การแปลผล):
Increased urinary calcium excretion (hypercalciuria) is a known contributor to kidney stone disease and osteoporosis. Many cases are genetic (often termed "idiopathic"). Previously such patients were often divided into fasting versus absorptive hypercalciuria depending on the level of urine calcium in a fasting versus fed state, but the clinical utility of this approach is now in question. Overall, the risk of stone disease appears increased when 24-hour urine calcium is >250 mg in men and >200 mg in women. Thiazide diuretics are often used to reduce urinary calcium excretion, and repeat urine collections can be performed to monitor the effectiveness of therapy.

Known secondary causes of hypercalciuria include hyperparathyroidism, Paget disease, prolonged immobilization, vitamin D intoxication, and diseases that destroy bone (such as metastatic cancer or multiple myeloma).

Urine calcium excretion can be used to gauge the adequacy of calcium and vitamin D supplementation, for example in states of gastrointestinal fat malabsorption that are associated with decreased bone mineralization (osteomalacia).
 
Clinical Reference (เอกสารอ้างอิง):
  1. Manufacturer’s reagent package insert, Architect® Calcium, ABBOTT Laboratories, Abbott Park IL 60064 USA.
  2. www.mayomedicallaboratories.com