Print  |  Email
Laboratory: Clinical Biochemistry
Test Name:
Test Code: NA
Clinical Information:
Sodium is the primary extracellular cation and functions to maintain fluid distribution and osmotic pressure. Measurement of sodium is important for the assessment of acid-base balance, water balance and dehydration. An elevated anion gap strongly suggests the presence of metabolic acidosis. The serum anion gap is calculated automatically on sera analyzed for Na+, Cl- and total CO2.
Anion gap = Na - (Cl + TCO2)  
Collection Devices:
Specimen Required:

Plasma: 2.0 mL
Pediatric Plasma: 0.2 mL

Stability 7 days at room temperature or refrigerated, 6 months frozen
Serum: 2.0 mL

Samples must be transferred to an aliquot tube, tightly capped and stored frozen if analysis will not be complete within 48 hours (#110-10-05 Serum / Plasma Separation Procedure and Transport)
Reference Values:
0 - 12 mo:  130-145 mmol/L
≥ 13 mo:    135-147
Stat or Routine
See Also:
More Information: