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Sodium Blood Test Normal Range Explained

Understand the sodium blood test, including its normal range, why it's performed, and what high or low sodium levels may indicate about your overall health and electrolyte balance.

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Written by Dr. Siri Nallapu

Reviewed by Dr. Md Yusuf Shareef MBBS

Last updated on 30th Jul, 2025

blood test

Sodium Blood Test Normal Range Explained

Introduction

When you visit a doctor for a routine check-up or due to certain symptoms, they may recommend a sodium blood test. This simple test helps measure the amount of sodium in your blood, which is crucial for maintaining proper body functions. But what does the normal range mean, and why is it important? Let’s break it down in simple terms.

What is a Sodium Blood Test?

A sodium blood test measures the concentration of sodium (Na+) in your blood. Sodium is an essential electrolyte that helps regulate:

  • Fluid balance in the body
  • Nerve and muscle function
  • Blood pressure

Your kidneys and hormones tightly control sodium levels. Too much or too little sodium can cause health problems, so keeping it within the normal range is vital.

What is the Normal Range for Sodium in Blood?

The normal sodium level in the blood is typically between 135 to 145 milliequivalents per litre (mEq/L).

  • Below 135 mEq/L - Hyponatremia (low sodium)
  • Above 145 mEq/L - Hypernatremia (high sodium)

Both conditions can be harmful if not managed properly.

Get Sodium Blood Test Here

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Why is Sodium Important for Health?

Sodium plays a key role in:

  • Maintaining hydration: Helps balance fluids inside and outside cells.
  • Nerve and muscle function: Sodium helps transmit nerve signals and muscle contractions.
  • Regulating blood pressure: Works with potassium to keep blood pressure stable.

When sodium levels are too high or too low, it can lead to serious complications like confusion, seizures, or even coma.

Symptoms of Abnormal Sodium Levels

Here are some of the symptoms of abnormal sodium levels:

1. Low Sodium (Hyponatremia): Below 135 mEq/L

  • Mild symptoms: Fatigue, headache, nausea
  • Moderate symptoms: Confusion, muscle cramps, weakness
  • Severe symptoms: Seizures, unconsciousness

2. High Sodium (Hypernatremia): Above 145 mEq/L

  • Mild symptoms: Thirst, dry mouth
  • Moderate symptoms: Restlessness, irritability
  • Severe symptoms: Muscle twitching, seizures, coma

Get Your Symptoms Checked By A Physician

Dr. M L Ezhilarasan, General Practitioner

Dr. M L Ezhilarasan

General Practitioner

6 Years • MBBS

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

550

Dr D M Karthik, General Practitioner

Dr D M Karthik

General Practitioner

4 Years • MBBS, Fellowship in Diabetes Mellitus, Advance certificate in Diabetes Mellitus, Derma Nutrition Certification

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

449

Dr. D Bhanu Prakash, General Practitioner

Dr. D Bhanu Prakash

General Practitioner

10 Years • MBBS, AFIH, Advanced certificate in critical care medicine, Fellowship in critical care medicine

Hyderabad

Apollo 24|7 Clinic, Hyderabad

660

What Causes Abnormal Sodium Levels?

Here are some of the causes of abnormal soidum levels:

Causes of Low Sodium (Hyponatremia)

  • Drinking too much water (diluting sodium)
  • Kidney disease or heart failure
  • Severe vomiting or diarrhoea
  • Certain medications (diuretics, antidepressants)
  • Hormonal imbalances (low adrenal or thyroid function)

Causes of High Sodium (Hypernatremia)

  • Severe dehydration (not drinking enough water)
  • Excessive salt intake
  • Diabetes insipidus (a condition affecting water balance)
  • Kidney problems
  • Fever or excessive sweating

How to Maintain Healthy Sodium Levels?

Here’s how to maintainhealthy sodium levels:

1. For Low Sodium (Hyponatremia)

  • Reduce water intake if advised by a doctor.
  • Increase salt in diet (only if recommended).
  • Treat underlying conditions (kidney, heart, or hormonal issues).

2. For High Sodium (Hypernatremia)

  • Drink enough water to stay hydrated.
  • Avoid excessive salty foods (processed snacks, canned foods).
  • Monitor diabetes or kidney conditions with your doctor.

General Tips for Balanced Sodium Levels

  • Stay hydrated: Drink water throughout the day.
  • Eat a balanced diet: Include fresh fruits, vegetables, and whole grains.
  • Limit processed foods: They often contain hidden salt.
  • Follow medical advice: If on diuretics or other medications, monitor sodium levels regularly.

When Should You Get a Sodium Blood Test?

Your doctor may recommend this test if you have:

  • Symptoms like confusion, weakness, or excessive thirst
  • Kidney or heart disease
  • Been taking diuretics (water pills)
  • Experienced severe vomiting or diarrhoea
  • A history of hormonal disorders

How to Book a Sodium Blood Test?

If you’re experiencing symptoms or need a routine check-up, you can easily book a sodium blood test through Apollo 24|7. It’s a quick and painless test that helps monitor your health.

Steps to Book:
1. Visit Apollo 24|7 website/app
2. Select "Lab Tests"
3. Choose "Sodium Blood Test"
4. Pick a convenient time & location
5. Get tested and receive results online

Conclusion

Sodium is essential for your body’s proper functioning, and keeping it within the normal range (135-145 mEq/L) is crucial. If you experience symptoms of imbalance, consult a doctor and get tested. Simple lifestyle changes like staying hydrated, eating a balanced diet, and avoiding excess salt can help maintain healthy sodium levels.

If you need a sodium blood test, book one today through Apollo 24|7 for a hassle-free experience.

Consult Top Specialists

Dr. M L Ezhilarasan, General Practitioner

Dr. M L Ezhilarasan

General Practitioner

6 Years • MBBS

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

550

Dr D M Karthik, General Practitioner

Dr D M Karthik

General Practitioner

4 Years • MBBS, Fellowship in Diabetes Mellitus, Advance certificate in Diabetes Mellitus, Derma Nutrition Certification

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

449

Dr. D Bhanu Prakash, General Practitioner

Dr. D Bhanu Prakash

General Practitioner

10 Years • MBBS, AFIH, Advanced certificate in critical care medicine, Fellowship in critical care medicine

Hyderabad

Apollo 24|7 Clinic, Hyderabad

660


 

Consult Top Specialists

Dr. Syed Ismail Ali, General Practitioner

Dr. Syed Ismail Ali

General Practitioner

7 Years • MBBS

Hyderabad

Apollo 24|7 Clinic, Hyderabad

499

Dr. M L Ezhilarasan, General Practitioner

Dr. M L Ezhilarasan

General Practitioner

6 Years • MBBS

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

550

Dr D M Karthik, General Practitioner

Dr D M Karthik

General Practitioner

4 Years • MBBS, Fellowship in Diabetes Mellitus, Advance certificate in Diabetes Mellitus, Derma Nutrition Certification

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

449

Dr. Mohammed Kamran, General Practitioner

Dr. Mohammed Kamran

General Practitioner

5 Years • MBBS, FIDM

Nashik

Apollo 24|7 Clinic - Maharashtra, Nashik

499

Dr. D Bhanu Prakash, General Practitioner

Dr. D Bhanu Prakash

General Practitioner

10 Years • MBBS, AFIH, Advanced certificate in critical care medicine, Fellowship in critical care medicine

Hyderabad

Apollo 24|7 Clinic, Hyderabad

660

Get Your Symptoms Checked By A Physician

Dr. Syed Ismail Ali, General Practitioner

Dr. Syed Ismail Ali

General Practitioner

7 Years • MBBS

Hyderabad

Apollo 24|7 Clinic, Hyderabad

499

Dr. M L Ezhilarasan, General Practitioner

Dr. M L Ezhilarasan

General Practitioner

6 Years • MBBS

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

550

Dr D M Karthik, General Practitioner

Dr D M Karthik

General Practitioner

4 Years • MBBS, Fellowship in Diabetes Mellitus, Advance certificate in Diabetes Mellitus, Derma Nutrition Certification

Visakhapatnam

Apollo 24|7 Clinic - Andhra Pradesh, Visakhapatnam

449

Dr. Mohammed Kamran, General Practitioner

Dr. Mohammed Kamran

General Practitioner

5 Years • MBBS, FIDM

Nashik

Apollo 24|7 Clinic - Maharashtra, Nashik

499

Dr. D Bhanu Prakash, General Practitioner

Dr. D Bhanu Prakash

General Practitioner

10 Years • MBBS, AFIH, Advanced certificate in critical care medicine, Fellowship in critical care medicine

Hyderabad

Apollo 24|7 Clinic, Hyderabad

660

Get Sodium Blood Test Here

250(₹625)60% off