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Test Code:
090-20-1320-01

Order Name:
Sodium (U-24 hrs)

 
Useful For:
Assessing acid-base balance, water balance, water intoxication, and dehydration
 
Methodology:
Ion-selective electrode diluted (Indirect)
 
AliasesName:
Na+ (Sodium), U-24 hrs.
 
 
 
Test Code:
090-20-1320-01

Order Name:
Sodium (U-24 hrs)

 
Collection Specimen Or Container:
24-hour urine, Clean containner without preservative added.

Note:
1.  Please keep in refrigerated (2oC to 8oC) during collection and transportation.
2.  24-hours volume is required.
 
Specimen Testing Type:
24-hour urine, minimum volume 10 mL
 
Sub Mission Container:
Clean container
 
Rejection Criteria:
Wrong preservative type will be reject.
 
Specimen Stabillity:
Specimen Type Temperature Time
24 hours urine Refrigerated, 2oC to 8oC 45 days
Frozen, -20oC 12 months
 
 
 
Test Code:
090-20-1320-01

Order Name:
Sodium (U-24 hrs)

 
Method detail:
Ion-selective electrode diluted (Indirect)
 
Schedule:
Tested daily (24 Hours)
 
Turnaround Time:
Collected specimen to report within 1.5 hours (90 mins)
 
Performing Location:
Chemistry, Laboratory Department Tel. 13224
 
Specimen Retention Time:
7 days
 
 
 
Test Code:
090-20-1320-01

Order Name:
Sodium (U-24 hrs)

 
 
Clinical Information:
Sodium is the major cation of extracellular fluid; it plays an essential role in the normal distribution of water and in the maintenance of osmotic pressure in extracellular fluid compartments. Decreased levels of sodium may be caused by an excessive use of diuretics, prolonged vomiting, a decrease in the intake of sodium in the diet, and metabolic acidosis. Increased levels of sodium may be found in Cushing’s syndrome, severe dehydration, or in high levels of salt intake without an adequate supply of water.
 
Reference Value:
40 – 220 mmol/24hours
 
Interpretation:
Urinary sodium (Na+) excretion varies with dietary intake, and there is a large diurnal variation with the rate of Na+ excretion during the night being only 20% of the peak rate during the day.

Na+ may be lost in the kidneys as a result of diuretic therapy, salt-losing nephropathies, or adrenal insufficiency, with the urinary Na+ concentration usually more than 20 mEq/L. In these hypovolemic states, urine Na+ values less than 10 mEq/L indicate extrarenal Na+ loss. In hypervolemic states, a low urine Na+ (<10 mEq/L) may indicate nephrotic syndrome in addition to nonrenal causes.
 
Clinical Reference:
  1. Manufacturer’s reagent package insert, Architect® ICT (Na+, K+, Cl-) Sample Diluent, Abbott Laboratories, Diagnostic Division, Abbott Park IL 60064 , May 2016.
  2. http://www.mayomedicallaboratories.com (Retrieved: 01 Jan 2019)