How Hair Mineral Analysis Works: The ICP-MS Science Explained

From a few strands of hair to measurements of minerals and trace elements: what actually happens inside the laboratory?

When you send a hair sample for mineral analysis, the final report may appear surprisingly simple: a list of elements, measured concentrations and laboratory reference information.

But producing those numbers requires considerably more science than simply placing a strand of hair into a machine.

Hair mineral analysis involves careful sample collection, laboratory preparation and highly sensitive analytical instrumentation capable of detecting elements at very low concentrations.

One technology used for elemental analysis is Inductively Coupled Plasma Mass Spectrometry (ICP-MS), a sophisticated form of mass spectrometry widely used for measuring trace elements.

At Marylebone Diagnostic Centre (MDC), we believe patients should understand not only what a test reports, but also the science behind the laboratory process and, importantly, what the results can and cannot tell you.

If you're considering testing, start with our main service page: Mineral Hair Analysis at MDC

Hair mineral analysis examines a small sample of hair to measure the concentration of selected elements within that sample.

Depending on the laboratory panel, these may include nutritional minerals and trace elements such as:

• Calcium
• Magnesium
• Zinc
• Copper
• Selenium
• Manganese
• Chromium

Some analyses may also measure potentially toxic elements such as:

• Lead
• Mercury
• Cadmium
• Arsenic

The important point is that the laboratory is measuring elements present within the submitted hair sample.

Hair is biologically different from blood.

Blood is continuously circulating and tightly regulated by the body. Hair, once formed, becomes a relatively stable keratinised tissue.

This makes hair an interesting sample for elemental analysis, but it also means that hair and blood results should not automatically be interpreted as equivalent measurements.

Hair grows from follicles supplied by blood vessels.

During formation, various elements can become incorporated into the developing hair shaft.

Once the hair emerges from the scalp, it becomes a relatively stable structure composed predominantly of keratin.

This means a laboratory can analyse the elemental composition of a section of hair.

However, hair is also exposed to the outside environment.

Shampoo, hair dye, bleach, swimming water, dust, occupational exposure and cosmetic products can potentially affect some measurements.

That's why proper collection and laboratory preparation matter enormously.

The process can broadly be understood in several stages.

A small quantity of hair is usually collected close to the scalp.

Hair from the scalp is generally preferred because:

• The collection location can be standardised.
• The section closest to the scalp represents more recent hair growth.
• It can be collected relatively easily and non-invasively.

The exact collection instructions depend on the laboratory performing the analysis.

Following those instructions carefully is important.

Hair does not grow indefinitely at the same rate, and different parts of a strand represent different periods of growth.

This is why laboratories generally specify:

• Where the hair should be collected.
• How much hair is required.
• The length of hair required.
• Whether recently dyed or chemically treated hair is suitable.

Sending a random handful of long hair may therefore not provide the same standardised sample as correctly collected scalp hair.

This is one of the most important parts of the entire process.

The laboratory cannot simply place untreated hair into an ICP-MS instrument.

The sample first requires controlled preparation.

Depending on the laboratory's validated method, this can include procedures intended to minimise external contamination before analysis.

This matters because the laboratory wants, as far as its method permits, to measure the elemental content associated with the submitted sample rather than simply contamination sitting on its surface.

Hair is a tough biological material largely composed of keratin.

To analyse its elemental composition using techniques such as ICP-MS, the sample normally undergoes chemical digestion.

In simplified terms, the solid hair sample is broken down using carefully controlled laboratory chemistry, often involving high-purity acids.

The objective is to convert the sample into a solution suitable for instrumental analysis.

This is where the process moves from something recognisable as hair to an analytical laboratory specimen.

ICP-MS stands for Inductively Coupled Plasma Mass Spectrometry.

It is an extremely sensitive analytical technique used to measure elements in many different types of samples.

ICP-MS is not exclusive to hair testing.

It is used across fields including:

• Clinical and biomedical research
• Environmental testing
• Food analysis
• Toxicology
• Pharmaceutical research
• Geological analysis
• Trace-element measurement

Its major advantage is its ability to measure multiple elements at very low concentrations.

This is where the science becomes fascinating.

The prepared liquid sample is introduced into the instrument, typically as a fine aerosol.

It then encounters an argon plasma operating at temperatures of several thousand degrees Celsius.

At these extreme temperatures, the sample is atomised and ionised.

In simple English: the instrument converts elements within the prepared sample into electrically charged particles called ions.

Those ions can then be analysed.

Different elements have different atomic masses.

The mass spectrometer separates and detects ions according to their mass-to-charge ratio (m/z).

The resulting signal allows the instrument, after appropriate calibration and quality control, to determine the concentration of selected elements in the prepared sample.

So, when your hair mineral report provides a measurement for zinc, magnesium, selenium or another element, that number is the end product of a much more complex analytical process.

That is the science behind the result.

One of the major advantages of ICP-MS is sensitivity.

Some elements occur at extremely low concentrations, requiring analytical equipment capable of distinguishing very small quantities.

Depending on the element, instrument and validated method, ICP-MS can provide extremely sensitive trace-element measurements.

It can also analyse multiple elements from the same prepared specimen, making it particularly useful for multi-element panels.

This is an important distinction.

Having sophisticated equipment does not automatically make every result clinically meaningful.

Laboratory quality also depends on factors such as:

• Correct sample collection.
• Appropriate sample preparation.
• Analytical calibration.
• Quality-control procedures.
• Contamination control.
• Validated methodology.
• Appropriate reporting.
• Responsible interpretation.

At MDC, we think patients should understand this distinction.

Analytical precision and clinical interpretation are related, but they are not the same thing.

A laboratory may be capable of measuring an element extremely precisely. The next question is what that measurement means for the individual patient.

This is probably one of the most important sections of this article.

Hair testing and blood testing examine different biological samples and should not automatically be considered interchangeable.

For example, a hair zinc result should not automatically be interpreted as proof that someone has a clinical zinc deficiency.

Where deficiency, toxicity or another medical condition is suspected, a doctor may recommend blood tests, urine tests or other investigations to confirm or investigate the finding.

This is why MDC approaches hair mineral analysis as one source of information within a wider clinical picture, rather than a standalone diagnosis.

Several factors may potentially influence results. These include:

Chemical colouring may introduce or alter certain elements within the hair.

Bleaching changes the physical and chemical structure of the hair shaft and may influence elemental measurements.

Some shampoos, conditioners, treatments and styling products contain minerals or other compounds that could potentially influence the sample.

Frequent exposure to chlorinated pools or certain water sources may affect external contamination.

People working with metals, industrial materials or certain chemicals may experience environmental exposure that requires careful interpretation.

Taking hair from the wrong area, submitting an inappropriate length or collecting insufficient material can affect sample standardisation.

This is why patients should always follow the collection instructions provided with their test.

Not by itself.

This is where responsible healthcare communication is important.

Hair mineral analysis can measure elemental concentrations within a hair sample, but a result should not automatically be translated into a diagnosis such as "You are zinc deficient" or "You have heavy-metal poisoning."

Clinical diagnosis may require:

• Medical history.
• Symptoms.
• Examination.
• Blood testing.
• Urine testing.
• Repeat testing.
• Specialist toxicology assessment.

The appropriate investigation depends on the element and clinical circumstances.

Don't panic, and don't immediately start taking large quantities of supplements.

Instead, ask:

• What exactly has been measured?
• How far is the result from the laboratory's reference information?
• Could hair treatment or environmental exposure have influenced it?
• Do I have symptoms that make the result clinically relevant?
• Should the finding be investigated with another type of test?

At MDC, this is where access to wider diagnostics becomes particularly useful.

If appropriate, findings can be considered alongside other investigations rather than interpreted in isolation.

This requires particular caution.

More is not always better when it comes to vitamins and minerals.

Excessive supplementation can itself cause problems, and some nutrients interact with one another.

For example, high-dose supplementation of one trace element may influence the absorption or metabolism of another.

Therefore, patients should avoid making major supplementation changes solely because a single hair result appears high or low.

Where appropriate, discuss the result with a healthcare professional and consider confirmatory testing.

Hair analysis is sometimes marketed heavily as a way of identifying "heavy-metal toxicity."

That claim requires caution.

Hair can contain measurable concentrations of elements such as mercury, lead, arsenic and cadmium, but interpretation depends on the element, exposure history, sampling methodology and clinical circumstances.

A raised result does not automatically establish poisoning.

If clinically significant toxic exposure is suspected, further investigation using appropriate validated clinical tests and specialist advice may be necessary.

When you receive your report, don't start by looking for every number highlighted as high or low.

Instead, work through it systematically:

• Step 1, Identify the element. Understand what was actually measured.
• Step 2, Look at the reported concentration and laboratory reference information.
• Step 3, Consider possible external influences, including hair products, colouring and environmental exposure.
• Step 4, Consider your symptoms and medical history.
• Step 5, Decide whether further clinical testing is appropriate.

This approach is far more useful than treating every abnormal-looking number as a diagnosis.

The Bottom Line

Hair mineral analysis is scientifically interesting because a seemingly simple biological sample can be transformed into detailed elemental measurements using sophisticated laboratory technology such as ICP-MS.

But the technology is only half the story.

The most useful approach combines good sample collection, robust laboratory analysis, appropriate interpretation and further testing where clinically necessary.

At Marylebone Diagnostic Centre, that is how we believe diagnostic testing should be approached: understand the science, understand the limitations and use the information responsibly.

Marylebone Diagnostic Centre provides Mineral Hair Analysis in London from our clinic at:

Marylebone Diagnostic Centre, 73 Baker Street, Marylebone, London W1U 6RD

Our location near Baker Street Underground Station makes the service accessible for patients travelling from Marylebone, Westminster, Mayfair, Fitzrovia, Paddington, Regent's Park, St John's Wood and across London.

For full information about the test, sample requirements and booking: Mineral Hair Analysis at Marylebone Diagnostic Centre