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Test Code NA Sodium, Plasma or Serum

Performing Laboratory

MaineGeneral Medical Center

Reference Values

135-145 mmol/L

Critical values (automatic call-back):  <120 mmol/L or >160 mmol/L

Specimen Requirements

Submit only 1 of the following specimens

Preferred: Plasma

Draw blood in a green-top (lithium heparin) tube(s). For pediatric specimen, draw blood in a green-top (lithium heparin) MICROTAINER(S)®. (Hemolyzed or lipemic specimen is not acceptable.) Spin down and send 1 mL of lithium heparin plasma refrigerated.

Note:  1. Indicate plasma on request form.

2. Label specimen with patient’s name (first and last), date of birth, date and time of draw, phlebotomist’s initials, and as plasma.

Alternate: Serum

Draw blood in a serum gel tube(s). (Hemolyzed or lipemic specimen is not acceptable.) Spin down and send 1 mL of serum refrigerated.

Note:  1. Indicate serum on request form.

2. Label specimen with patient’s name (first and last), date of birth, date and time of draw, phlebotomist’s initials, and as serum.

Sample may be stored at 2-8C for up to seven (7) days when removed from the cells. Freeze for longer storage.

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding

84295

Methodology

Indirect Ion Selective Electrode