Sodium (Na)

About Test

The Sodium (Na) test measures the level of sodium, a key electrolyte, in the blood. Sodium is essential for maintaining fluid balance, regulating blood pressure, and ensuring proper muscle and nerve function. It works in conjunction with other electrolytes, such as potassium and chloride, to help regulate the body's fluid levels and acid-base balance.

This test is often included in an electrolyte panel and is used to assess overall electrolyte balance and kidney function. Abnormal sodium levels, whether too high (hypernatraemia) or too low (hyponatraemia), can indicate various health conditions such as dehydration, kidney disease, heart failure, or hormonal imbalances.

Regular monitoring of sodium levels is important for managing conditions that affect fluid and electrolyte balance. It allows healthcare providers to make informed decisions about treatments, such as adjusting medications or dietary recommendations, to maintain healthy sodium levels and support overall health and well-being.

Sample Requirements

Gold SST Tube

Stability

Serum: 7days 2-8°C, 24 hours 15-25°C

Turnaround Time

4 hours

Assay Interferences

Recovery within ± 10 %

Hemolysis

Sodium and chloride: 1000 mg/dL (621 μmol/L) hemoglobin (approximate H index 1000)

Potassium: Do not use hemolyzed samples.

Icterus

Bilirubin (conjugated/unconjugated): 60 mg/dL (1026 μmol/L) bilirubin (approximate I index 60)

Lipemia

Intralipid: 2000 mg/dL Intralipid (corresponding to an approximate L index of 2000)

Medications

Acetaminophen (paracetamol): 200 mg/L

Acetylcysteine: 150 mg/L

Acetylsalicylic acid: 1000 mg/L

Ampicillin Na: 1000 mg/L

Ascorbic acid: 300 mg/L

Cefoxitin: 2500 mg/L

Cyclosporin: 5 mg/L

Doxycyclin: 50 mg/L

Heparin: 5000 U

Ibuprofen: 500 mg/L

Intralipid: 10000 mg/L

L Dopa: 20 mg/L

Methyldopa: 20 mg/L

Metronidazol: 200 mg/L

Phenylbutazone: 400 mg/L

Rifampicin: 60 mg/L

Theophylline: 100 mg/L

Reference Range (mmol/L):

135.0 – 145.0

Critical Value:

Below 125 (130 if <16yo) or above 150 mmol/L