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Sodium, Plasma / Serum

Item Value
Approval req'd? No
Available Stat? Yes
Test code NA
Test group Sodium
Performed by Parnassus, Mission Bay & Mt. Zion Chemistry
In House Availability Test available 24 hours per day 7 days per week
Method Ion selective electrode (ISE)
Container type Light green top preferred, Gold top acceptable
Amount to Collect 1 mL blood
Click here for Microdetermination info
Sample type Plasma or serum
Preferred volume 0.5 mL plasma or serum
Min. Volume 0.2 mL plasma or serum
Click here for Microdetermination info
Units mmol/L
Normal range
< 1 year 131 - 145 mmol/L
≥ 1 year 135 - 145 mmol/L

1. Normal range for children less than 1 year old adapted from Beckman Coulter's "Pediatric Reference Range Guidelines for Synchron Systems" Bulletin 9345
2. Normal range for adults was determined by testing 271 male and female healthy blood donors at UCSF.
Critical value < 125 mmol/L or > 155 mmol/L
Synonyms Na; Electrolytes; Anion gap
Stability Room temperature 8 hours, refrigerated 2 days, frozen at -20C 1 week
Turn around times STAT 1 hour, Routine 4 hours
Additional information Severely lipemic serum/plasma samples will be treated and reassayed.

High levels of glucose can lower electrolyte concentrations, each 100 mg/dL causing an apparent decrease in serum sodium of 1.6 mmol/L Ref: Schrier RW: Manual of Nephrology, Boston, Little Brown, 1981

The anion gap is calculated from the serum Sodium, Chloride and Total CO2 values using the equation: Na-(CL+CO2). The calculation is automatic whenever all three of the electrolytes are ordered together. It is not a separately orderable test. Normal range for the Anion Gap is 4-14.
CPT coding 84295
LOINC code 2951-2
Last Updated 6/22/2016 13:00:07
Entry Number 860
Lab Procedure Link Click here for Procedure
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