Sodium Test

Sodium Test

Category
Electrolytes
Sample
Blood sample taken from a vein in your arm
Reports () Terms & Conditions Report time varies with time of sample collection.
In 2 days
Fasting
No Fasting
Age
5+ Years

What Is This Test?

Measures sodium, the main electrolyte that controls water balance and nerve function.

Why this test is performed?

Detects low sodium (hyponatraemia) — common in the elderly, with diuretics, vomiting or heart/liver/kidney disease — or high sodium from dehydration. Both can cause confusion, weakness or seizures.

Who should take this test?

Vomiting, diarrhoea, dehydration, weakness, people on BP medicines or diuretics, kidney or heart conditions.

Test Preparation

No fasting needed.

Medical disclaimer · for information only, not medical advice

This article is for general information and education only. It is not medical advice, does not create a doctor–patient relationship, and is not a substitute for consultation with a qualified doctor who has assessed your individual situation. Never delay seeking medical advice because of something you have read here.

In a medical emergency, call 112, or 108 for an ambulance where that service operates, or go to your nearest emergency department. If you are in mental health distress, Tele-MANAS is free and available 24×7 on 14416.

Read our Editorial Policy and Medical Review Process.

Frequently asked questions

Diuretics and some antidepressants, excessive water intake, heart failure and hormonal problems are common causes.

No fasting is needed. You can eat and drink normally unless your doctor has advised otherwise.

Blood sample taken from a vein in your arm.

Usually within 11–35 hours after the sample reaches the lab. You will receive the report online.

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