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Hair Sodium Content (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of sodium naturally present in a sample of your hair. Hair sodium levels can sometimes reflect long-term sodium balance in the body, though they are not a direct measure of current sodium levels in blood.

Quick summary

["Hair sodium testing may help assess chronic sodium exposure or metabolic conditions over time."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
50912-5
Short code
Sodium Hair-sCnt
Synonyms
Sodium Hair-sCnt
Category
electrolyte
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Ref low
136
Ref high
145
Critical range
120 N/A – 160 N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
84295
SNOMED
110741000
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

What Does This Test Measure?

Hair sodium content is determined by analyzing a small portion of your hair. Sodium is an essential electrolyte that helps regulate fluid balance and nerve function. In hair, sodium levels can accumulate over time, reflecting past dietary or physiological influences.

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms or conditions related to long-term sodium imbalance, such as high blood pressure, kidney disease, or metabolic disorders. It may also be used in research or specialized clinical settings to monitor sodium exposure in specific populations.

How Is the Test Performed?

A small sample of your hair is collected, typically from the scalp or other areas. The hair is processed in a lab to measure sodium content using specialized techniques like high-performance liquid chromatography (HPLC) or similar methods.

What Does the Test Result Mean?

Results are expressed as mass concentration (e.g., milligrams per gram of hair). Higher levels may suggest increased sodium intake or retention, while lower levels could indicate reduced exposure. Interpretation depends on clinical context and comparison to baseline or reference ranges specific to the lab.

Reference range

Adult: 136-145 mmol/LN/A

Specimen: serum

No special preparation required. Stay well hydrated.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Hair Sodium Test

Frequently asked questions

How often will I need to take this test?
Hair sodium testing is generally not a routine screening test for sodium levels. It may be performed occasionally in specialized clinical situations, such as monitoring chronic conditions or research studies. Your provider will determine the frequency based on your specific needs and medical history.
What are the typical reference ranges for this test?
Reference ranges for hair sodium content vary by lab and may not be standardized. They are often compared to baseline values or specific patient profiles rather than universal ranges. Your results will be discussed with your healthcare provider in the context of your overall health.
Can I prepare for this test in any way?
No special preparation is needed for a hair sodium test. You may wash your hair with mild soap and water before collection, but avoid heavy conditioners or styling products that could interfere with the sample. Follow your provider’s instructions for hair collection.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy