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Test Code NA Sodium

Additional Codes

Epic: LAB122

Specimen Required

Specimen Type: Serum

Collection Container/Type

Preferred: Serum gel

Acceptable: Green top (Lithium heparin)

Submission Container/Tube: Plastic vial

Specimen Volume: 3.5 mL

Collection Instructions: Centrifuge and separate cells after clot formation and within 4 hours of collection. 

Specimen Minimum Volume

0.5 mL

Specimen Stability

Room temperature: 14 days

Refrigerated: 14 days

Frozen: 1 year

Reference Range

0 – 1 week:

133 – 146 mEg/L

1 week – 150 years:

136 – 145 mEg/L

Rejection Due To

Unlabeled, mislabeled, wrong tube type, QNS, Hemolysis index >400, gross lipemia.

Report Available

Same day

Clinical Significance

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 Na+ 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 Na+ may be found in Cushing’s syndrome, severe dehydration, or in high levels of salt intake without an adequate supply of water.

Method Name

Indirect Ion-Selective Electrode (diluted)
(ICT = Integrated Chip Technology)

Day(s) Performed