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Test Code NA Sodium, Plasma or Serum

Additional Codes

EPIC:  LAB122

Methodology

Ion-Selective Electrode (ISE)


Used in diagnosis and treatment of aldosteronism, diabetes insipidus, adrenal hypertension, Addison’s disease, dehydration, inappropriate antidiuretic hormone secretion, or other diseases involving electrolyte imbalance.

Performing Laboratory

St. Joseph Hospital

Specimen Requirements

Submit only 1 of the following specimens:

 

Preferred:

Plasma

Draw blood in a light green-top (lithium heparin gel) tube(s). Spin down, separate plasma from cells within 2 hours of draw, and send 1 mL of lithium heparin plasma refrigerated.

Note:  1. Indicate plasma on request form.

2. Label specimen appropriately (plasma).

 

Alternate:

Serum

Draw blood in a plain, red-top tube(s) or a serum gel tube(s). Spin down, separate serum from cells within 2 hours of draw, and send 1 mL of serum refrigerated.

Note:  1. Indicate serum on request form.

2. Label specimen appropriately (serum).

Reference Values

136-145 mmol/L
Critical values:  <120 mmol/L or >160 mmol/L

Day(s) Test Set Up

Monday through Sunday

Available STAT

Test Classification and CPT Coding

84295