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Sodium, whole blood

Item Value
Approval req'd? No
Available Stat? Yes
Test code NAWB
Test group Sodium
Performed by
Parnassus Parnassus Chemistry
Mount Zion MtZ Clinical Laboratory
Mission Bay Hospital Laboratory

In House Availability Test available 24 hours per day 7 days per week
Method Direct Ion selective electrode (ISE)

Parnassus & Mission Bay Radiometer ABL 800
MtZ Gem Premier 3500
Collection Instructions Venous samples:
1. Avoid excessive venous stasis from prolonged tourniquet application or clenching of the fist prior to sample collection.
2. For central line draws make sure to waste a full red top tube then draw via the blood gas syringe as noted above.
3. Fill syringe completely, remove needle (in peripheral draws), cap sample, expel all bubbles (while holding syringe upright) until blood hits the top of cap.
4. Label sample with patient's name, ID number and DOB.

Deliver samples immediately to lab for testing. Send samples via pneumatic tube to Parnassus Chemistry station #151, Mission Bay station #21. Hand deliver samples to Mount Zion Lab, B bldg, second floor.
Container type ABG syringe containing 100U of dry heparin
Amount to Collect 3 mL blood
Sample type Heparinized whole blood (Blood gas syringe only)
Preferred volume 3 mL blood
Min. Volume 1 mL blood
UCSF Rejection Criteria Samples with needle attached, containing large bubbles, unlabeled, clotted or of insufficient volume
Units mmol/L
Normal range 136-146 mmol/L
Critical value < 125 mmol/L or > 155 mmol/L
Synonyms Na; Electrolytes
Turn around times Stat 15 min, Routine 30 min
Additional information A level < 110 mmol/L or > 170 mmol/L will automatically be re-assayed.

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
CPT coding 84295
LOINC code 2947-0
Last Updated 7/26/2017 5:55:25 PM
Entry Number 861
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