TEST DIRECTORY | MIDx Labs

SODIUM (NA)

Major extracellular cation that represents water balance and osmotic status.

LIS TEST CODE: NA

CPT CODE: 84295

ALIASES: Na

METHODOLOGY: Ion-Selective Electrode Diluted (Indirect)

SPECIMEN:

- Type: Serum

- Container: Gold Top (SST) Vacutainer

- Minimum Volume Required: 1 mL

- Storage/Handling: Allow 30 minutes for blood to clot, then centrifuge specimen at 3500 RPM for 10 minutes. Maintain specimen at either room temperature, in the refrigerator, or in the freezer until testing can be performed.

NOTE: If freezing is required to preserve stability, transfer serum into a separate plastic screw-cap transport container.

- Stability: Room Temperature (20-25 °C): 7 days

Refrigerated (2-8 °C): 7 days

Frozen (-20 °C or colder): 1 year; avoid multiple freeze/thaw cycles.

- Turnaround Time: 24 hours from receipt.

Special Instructions: N/A

REJECTION REASONS: QNS, Gross Hemolysis, Gross Lipemia, Contamination, Stability Violation, Expired Container, Incorrect Container

REFERENCE RANGES:

Males & Females (mmol/L)

>= 1 year of age: 136 - 145

Panic Threshold(s): <= 120 mmol/L; >= 160 mmol/L for Males & Females >= 1 year of age.