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HomeLab Services GuideTests
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Overview
ข้อมูลทั่วไป Specimen
ข้อมูลสิ่งส่งตรวจ Performance
ข้อมูลการทดสอบ Clinical & Interpretation
ข้อมูลทางคลินิก
 
Test Code (รหัสการทดสอบ):
MGU24
Order Name (ชื่อการทดสอบ):
Magnesium, Urine 24-Hour
 
Specimen / Container (สิ่งส่งตรวจ/ภาชนะ):
24-hour urine, Clean containner with preservative
Preservative -  can be selected as list below:
  1. 20 mL of 6N HCL (Preferred) or
  2. 10 mL of 25% HCl or
  3. non preservative if order with Protein (U-24 hrs) or Microalbumin ( U-24 hrs)
Note:
  • Please keep in refrigerated (2-8°C) during collection and transportation
  • 24-hours volume is required.
 
Turnaround Time (ระยะเวลารอผล):
Collected specimen to report within 90 min
 
Useful For (ประโยชน์การทดสอบ):
  1. Assessing the cause of abnormal serum magnesium concentrations
  2. Determining whether nutritional magnesium loads are adequate
  3. Calculating urinary calcium oxalate and calcium phosphate supersaturation and assessing kidney stone risk.
 
Methodology (วิธีการทดสอบ):
 Enzymatic
 
AliasesName (ชื่อเรียกอื่นๆ) :
Mg (Magnesium), U-24 hrs.
 
 
 
Test Code (รหัสการทดสอบ):
MGU24
Order Name (ชื่อการทดสอบ):
Magnesium, Urine 24-Hour
 
Collection Specimen Or Container (สิ่งส่งตรวจ/ภาชนะ):
24-hour urine, Clean containner with preservative
Preservative -  can be selected as list below:
  1. 20 mL of 6N HCL (Preferred) or
  2. 10 mL of 25% HCl or
  3. non preservative if order with Protein (U-24 hrs) or Microalbumin ( U-24 hrs)
Note:
  • Please keep in refrigerated (2-8°C) during collection and transportation
  • 24-hours volume is required.
 
Specimen Testing Type (สิ่งส่งตรวจที่ใช้ในการทดสอบ):
24-hour urine,minimum volume 10 mL
 
Sub Mission Container (ภาชนะส่งตรวจ):
Clean container
 
Rejection Criteria (เกณฑ์ปฏิเสธสิ่งส่งตรวจ):
Wrong preservative type will be reject
 
Specimen Stabillity (ความคงตัวของสิ่งส่งตรวจ):
Specimen Type Temperature Time
U-24 hours Refrigerated, 2oC to 8oC 3 days
Frozen, -20oC 12 months
 
 
 
Test Code (รหัสการทดสอบ):
MGU24
Order Name (ชื่อการทดสอบ):
Magnesium, Urine 24-Hour
 
Method detail (วิธีการทดสอบ):
 Enzymatic
 
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):
MGU24
Order Name (ชื่อการทดสอบ):
Magnesium, Urine 24-Hour
 
 
Clinical Information (ข้อมูลทางคลินิก):
Magnesium is an essential nutrient which is involved in many biochemical functions. It has a structural role in nucleic acids and ribosomal particles, required as an activator for many enzymes and has a role in energy producing oxidative phosphorylation.
The normal body contains between 21 to 28 g magnesium, more than 50% of which is complexed with calcium and phosphate in bone. Only approximately 1% of the total magnesium is found in the extracellular fluid; hence, it tends to enter and leave cells under the same conditions as potassium. Approximately 35% of plasma magnesium is protein-bound, mainly to albumin, and therefore changes in albumin concentration may affect magnesium.
Hypomagnesemia results in the impairment of neuromuscular function and may develop in severe prolonged diarrhea, malabsorption syndromes, hyperaldosteronism, and diuretic therapy. Hypermagnesemia is seen in renal glomerular failure and diabetic coma.
 
Reference Value (ค่าอ้างอิง):
72.9 – 121.5 mg/day
 
Interpretation (การแปลผล):
Urinary magnesium excretion should be interpreted in concert with serum concentrations.

In the presence of hypomagnesemia, a 24-hour urine magnesium >24 mg/day or fractional excretion >0.5% suggests renal magnesium wasting. Lower values suggest inadequate magnesium intake and/or gastrointestinal losses.

In the presence of hypermagnesemia, urinary magnesium levels provide an indication of current magnesium intake.

Lower urinary magnesium excretion increases urinary calcium oxalate and calcium phosphate supersaturation and could contribute to kidney stone risk.
 
Clinical Reference (เอกสารอ้างอิง):
  1. Manufacturer’s reagent package insert, Architect® Magnesium, Abbott Laboratories, Abbott Park IL 60064 USA .
  2. http://www.mayomedicallaboratories.com (Retrieved: 01 Jan 2019)