Sodium, Plasma, Serum, or Urine

Test Code

CPT Codes
84295 serum/plasma, 84300 urine

Preferred Specimen

Submit only 1 of the following specimens:

Plasma

Draw blood in a green-top (lithium heparin) tube. Spin specimen
down and send 1 mL of plasma.

Note: 1. Indicate plasma.

2. Label specimen appropriately (plasma).

Serum

Draw blood in a plain, red-top tube. Spin specimen down and send
1 mL of serum.

Note: 1. Indicate serum.

2. Label specimen appropriately (serum).

Urine

1 mL from a 24-hour or random urine collection. No
preservative. Follow instructions in Urine
Collections in Special Instructions.

Note: 1. Indicate urine.

2. Label specimen appropriately (urine).

Instructions

NMMC-Urine Collections

Transport Temperature

Refrigerate

Methodology
Ion-Selective Electrode (ISE)

Setup Schedule

Monday through Sunday

Reference Range

PLASMA OR SERUM

136-145 mEq/L

Critical values

0-12 years: ≤125 mEq/L or ≥150 mEq/L

Adults: ≤115 mEq/L or ≥160 mEq/L

RANDOM URINE

30-90 mEq/L

24-HOUR URINE

40-220 mEq/24-hour

Performed By
North Mississippi Medical Center Pathology Department

Performing Laboratory
NMMC Pathology Department

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.