Sodium Blood Test (Sodium Serum)

When Should You Get a Sodium Blood Test Done?

You may need a sodium blood test if you:

• Experience symptoms such as dizziness, fatigue, confusion, or muscle cramps

• Have medical conditions affecting sodium balance, including kidney, heart, or liver problems

• Take medications that influence electrolyte levels

• Are undergoing routine health check-ups or pre-surgical assessments

Early testing helps detect imbalances and allows timely intervention to prevent complications.

Normal Sodium Levels in Blood

Sodium levels in the blood are an important indicator of electrolyte balance and overall health. Maintaining sodium within the normal range is essential for proper nerve and muscle function, fluid balance, and blood pressure regulation. Abnormal levels may signal dehydration, kidney or heart issues, or hormonal imbalances.

What is the Average Sodium Level Range?

In healthy adults, normal sodium levels in the blood typically range from 135 to 145 milliequivalents per litre (mEq/L). Values within this range are considered balanced, while consistent deviations may require medical attention. Small, temporary fluctuations can occur due to factors, such as diet, hydration, or exercise.

Normal Sodium Levels by Age & Gender

Normal sodium levels are generally consistent across adults, but minor variations can occur with age and sex:

• Children: 135–145 mEq/L, similar to adults

• Adults: 135–145 mEq/L

• Older adults: Levels may remain within the standard range, but age-related health conditions can influence sodium balance

Consult a healthcare provider for interpretation of results, as individual factors may affect what is considered normal.

Understanding High Sodium Levels (Hypernatremia)

Hypernatraemia occurs when the sodium concentration in the blood rises above the normal range of 135–145 mEq/L. Elevated sodium levels can disrupt the balance of fluids in the body, affecting nerve and muscle function. Detecting high sodium early through a sodium blood test helps prevent complications and allows timely management.

Causes of Elevated Blood Sodium Levels

High sodium levels can result from a variety of factors, such as:

• Dehydration due to inadequate fluid intake or excessive fluid loss

• Kidney disorders that impair sodium excretion

• Excessive consumption of salty foods or intravenous saline

• Hormonal imbalances affecting fluid and electrolyte regulation

• Certain medications, such as diuretics or corticosteroids

• High Sodium Level Symptoms

Symptoms of Hypernatraemia 

• Intense thirst and dry mouth

• Fatigue or weakness

• Confusion or irritability

• Muscle twitching or spasms

• Rapid heart rate

Side Effects of High Sodium Levels

If left untreated, elevated sodium can lead to:

• Increased blood pressure

• Dehydration of tissues and organs

• Kidney strain or damage

• Neurological issues such as seizures or confusion

• Severe complications in older adults or those with chronic conditions

Understanding Low Sodium Levels (Hyponatremia)

Hyponatraemia occurs when the sodium concentration in the blood falls below the normal range of 135–145 mEq/L. Low sodium levels can upset the body’s fluid balance and affect nerve and muscle function. Early detection through a sodium blood test is essential to manage the condition and prevent complications.

Causes of Low Serum Sodium

Low sodium levels can be caused by:

• Excessive fluid intake that dilutes sodium in the blood

• Kidney disorders affecting sodium retention

• Heart, liver, or kidney failure leading to fluid imbalances

• Hormonal imbalances, such as adrenal insufficiency

• Certain medications, including diuretics, antidepressants, or anticonvulsants

Symptoms of Low Sodium Level in the Body

Common signs of hyponatraemia include:

• Nausea or vomiting

• Headache or confusion

• Fatigue or weakness

• Muscle cramps or spasms

• Seizures in severe cases

Side Effects of Low Sodium Levels

If untreated, low sodium can result in:

• Swelling of tissues, including the brain (cerebral oedema)

• Increased risk of falls, especially in older adults

• Impaired cognitive function

• Muscle and nerve dysfunction

• Severe complications in critical cases, such as coma

How is a Sodium Blood Test Performed?

A sodium blood test involves taking a small blood sample from a vein, usually in the arm. The sample is then analysed in a laboratory to determine whether your sodium levels are within the normal range. The procedure is quick, safe, and generally causes only mild discomfort.

Home Sample Collection by MaxAtHome

MaxAtHome offers a reliable and convenient way to get a sodium blood test done at home. The process is simple and patient-friendly, ensuring comfort, safety, and accuracy at every step:

• A trained healthcare professional visits your home at a scheduled time.

• The blood sample is collected safely and hygienically using standard medical protocols.

• The sample is transported to an accredited laboratory for accurate analysis.

• Results are delivered securely, allowing you to discuss them with your doctor without visiting a lab.

Home collection is especially suitable for individuals with mobility issues, busy schedules, or those who prefer the comfort and safety of home testing.

How to Prepare for a Sodium Level Test

Preparing for a sodium blood test is usually straightforward. In most cases, no special preparation is required. However, following a few simple steps can help ensure accurate results:

• Follow the doctor’s instructions regarding fasting or medication adjustments.

• Stay hydrated by drinking water, unless advised otherwise.

• Avoid excessive salt intake immediately before the test.

• Inform your healthcare provider about any medications or supplements you are taking, as some may affect sodium levels.

Interpreting Blood Sodium Level Test Results (Na+)

The sodium blood test results indicate whether the sodium concentration in the blood is within the normal range of 135–145 mEq/L. Values outside this range may signal an imbalance that requires medical attention.

What Does it Mean if the Blood Sodium Level is High or Low?

Note: This table provides a quick overview to help you understand what your sodium blood test results may indicate. Always discuss abnormal results with a healthcare provider to determine the appropriate next steps.

Sodium Blood Test Cost

The cost of a sodium blood test can vary depending on the type of service and location. At MaxAtHome, you can have the test performed conveniently at home, which includes professional sample collection and laboratory analysis.

Key points about the cost:

• MaxAtHome maintains transparent and competitive pricing to make quality diagnostics accessible to everyone.

• The test cost includes doorstep sample collection, NABL-accredited lab processing, and timely digital report delivery.

• There are no hidden or additional charges for home collection services.

• By combining accuracy, convenience, and affordability, MaxAtHome ensures exceptional value for every diagnostic test.

Booking your sodium blood test with MaxAtHome allows you to know the price upfront, avoid unexpected charges, and enjoy the convenience of home testing.

Why Book Your Serum Sodium Test with MaxAtHome?

Booking your sodium blood test with MaxAtHome offers convenience, safety, and accurate results. A trained healthcare professional collects your sample at home, reducing the need to visit a laboratory.

Key benefits include:

• Comfort and convenience: Testing is done at your preferred time and location.

• Professional and safe collection: Trained staff follow strict medical protocols.

• Accurate and reliable results: Samples are analysed in accredited laboratories.

• Secure result delivery: Access your results digitally and discuss them with your doctor.

MaxAtHome makes it easy to monitor your sodium levels without disrupting your routine, providing a reliable and stress-free testing experience.