Dihydrotestosterone Test: DHT Blood Test for Hair Loss

What Is a Dihydrotestosterone Test?

A Dihydrotestosterone test is a blood test that measures the level of Dihydrotestosterone, commonly known as DHT, in the bloodstream.

DHT is produced when part of the body’s testosterone is converted into dihydrotestosterone by an enzyme called 5-alpha reductase. It belongs to a group of hormones called androgens, which are often known as male-type hormones, although they are naturally present in both men and women.

DHT has normal functions in the body. It plays a role in the development of male characteristics, body hair growth, skin oil production, and certain reproductive functions. However, in people who are genetically sensitive to DHT, this hormone may affect scalp hair follicles and contribute to gradual hair thinning or pattern hair loss.

This is why the DHT blood test is commonly requested when evaluating hair loss, especially when male pattern baldness, female pattern hair thinning, or androgen-related hair loss is suspected.

Why Is a DHT Test Important?

A DHT test can help doctors assess androgen activity in the body and understand whether DHT may be involved in symptoms such as hair loss, acne, oily skin, or unwanted hair growth.

The test is especially useful when the doctor wants to evaluate the hormonal side of hair loss or investigate signs of androgen imbalance. It may also be used in selected medical situations related to testosterone conversion and 5-alpha reductase activity.

However, the test does not diagnose a condition by itself. A high or low DHT result must be interpreted by a healthcare provider based on the patient’s symptoms, age, sex, medication history, and other test results.

DHT and Hair Loss: What Is the Connection?

The connection between DHT and hair loss is one of the main reasons people search for a Dihydrotestosterone test.

In people with genetic sensitivity to DHT, the hormone may affect scalp hair follicles over time. This may lead to a process called follicle miniaturization, where hair follicles gradually become smaller and produce thinner, weaker, and shorter hairs.

Over time, this can cause:

• A receding hairline.
• Thinning hair at the crown.
• Wider hair parting.
• Reduced hair density.
• Male pattern baldness.
• Female pattern hair thinning.

It is important to understand that DHT is not the only cause of hair loss. Hair loss may also be caused by iron deficiency, thyroid disorders, vitamin D deficiency, stress, pregnancy, childbirth, certain medications, autoimmune conditions, scalp diseases, or nutritional deficiencies.

For this reason, a DHT test for hair loss can help evaluate one possible hormonal factor, but it does not provide a complete diagnosis by itself.

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Who Should Consider a Dihydrotestosterone Test?

A doctor may recommend a Dihydrotestosterone test for people who have symptoms that may be related to androgen hormones.

You may be advised to take a DHT blood test if you have:

• Persistent or unexplained hair loss.
• A receding hairline.
• Thinning hair at the crown or frontal scalp.
• Male pattern baldness.
• Female pattern hair thinning.
• Severe or recurring acne.
• Unwanted facial or body hair growth in women.
• Irregular menstrual cycles with signs of androgen excess.
• Suspected hormonal imbalance.
• A need to evaluate androgen activity or 5-alpha reductase function.

If your doctor has requested this test, booking a Dihydrotestosterone blood test can help provide useful information as part of your hormonal assessment.

When Do Doctors Request a DHT Test?

Doctors may request a DHT test when symptoms suggest a possible androgen-related condition.

Common reasons include:

• Evaluating hair loss or pattern baldness.
• Investigating signs of androgen excess.
• Assessing acne linked to hormonal changes.
• Evaluating unwanted hair growth in women.
• Monitoring certain hormone-related treatments.
• Reviewing selected conditions related to testosterone conversion.
• Supporting the assessment of 5-alpha reductase activity.

The exact reason for testing should always be determined by a healthcare provider.

Symptoms of High DHT Levels

High DHT activity or increased sensitivity to DHT may be associated with different symptoms in men and women. These symptoms can vary depending on age, sex, genetics, overall health, and hormone balance.

Possible Symptoms in Men

High DHT levels or increased DHT sensitivity may be linked to:

• Gradual receding hairline.
• Thinning hair on the top of the scalp.
• Male pattern baldness.
• Oily skin.
• Acne.
• Prostate-related concerns in selected cases.

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Possible Symptoms in Women

In women, high androgen activity may be associated with:

• Hair thinning or increased hair shedding.
• Unwanted facial or body hair growth.
• Persistent acne.
• Irregular menstrual cycles.
• Other signs of hormonal imbalance.

These symptoms do not always mean that DHT is the main cause. A medical evaluation is needed to identify the real reason behind the symptoms.

Causes of High DHT Levels

Several factors may contribute to high DHT levels or increased DHT activity in the body.

Common causes include:

• Higher testosterone levels, because testosterone is the main source of DHT.
• Increased activity of the 5-alpha reductase enzyme.
• Genetic sensitivity to DHT, especially in pattern hair loss.
• Polycystic ovary syndrome, also known as PCOS, in women.
• Use of anabolic steroids or hormone-related medications.
• Adrenal gland disorders that increase androgen production.
• Certain prostate-related conditions in men.

High DHT does not always mean that a person has a disease. The result must be interpreted based on symptoms, medical history, and other laboratory findings.

Can a DHT Test Detect the Cause of Hair Loss?

A DHT test for hair loss can help doctors understand whether androgen hormones may be involved, but it cannot identify the full cause of hair loss on its own.

Hair loss is often caused by more than one factor. A doctor may need to examine the scalp, review the pattern of hair loss, and request additional tests to check for other common causes.

These may include tests for:

• Iron deficiency.
• Thyroid function.
• Vitamin D deficiency.
• Hormonal imbalance.
• Nutritional deficiencies.
• Inflammatory or autoimmune conditions.
• Scalp or dermatological diseases.

A DHT Test may be useful, but it is usually part of a wider diagnostic approach.

Does a DHT Test Require Fasting?

In most cases, a DHT blood test does not require fasting. It is a hormone test performed using a blood sample.

However, preparation instructions may vary depending on the laboratory, your doctor’s request, and whether other blood tests are being performed at the same time.

Before taking the test, tell your doctor or laboratory if you are taking:

• Hormonal medications.
• Hair loss medications.
• Prostate medications.
• Steroids.
• Supplements.
• Any treatment that may affect testosterone or DHT levels.

Do not stop any medication before testing unless your doctor tells you to do so.

Want to book your test?
Contact the laboratory to confirm whether fasting is needed, when to collect the sample, and how long the result will take.

How Is the DHT Blood Test Performed?

The DHT blood test is simple and quick. A small blood sample is collected from a vein, usually from the arm. The sample is then sent to the laboratory to measure the level of dihydrotestosterone in the blood.

The blood draw usually takes only a few minutes. You may feel a mild pinch during needle insertion, similar to other routine blood tests.

After the sample is collected, you can usually return to your normal daily activities unless your doctor or laboratory gives you different instructions.

When Will DHT Test Results Be Available?

The result of a Dihydrotestosterone test is usually available within a few working days. The exact turnaround time may vary depending on the laboratory, the testing method, and whether the sample is processed in-house or sent to a reference laboratory.

It is best to ask the laboratory when booking your DHT test about the expected time for receiving your result.

DHT Test Normal Range

There is no single universal DHT test normal range that applies to everyone. Normal DHT levels may vary depending on several factors, including:

• Sex.
• Age.
• Laboratory method.
• Measurement unit.
• Health condition.
• Medications.
• Reference range used by the laboratory.

In general, DHT levels are usually higher in adult men than in adult women. Some references mention that adult male DHT levels may commonly fall within approximately 30–85 ng/dL, while adult female levels are usually lower. However, these values can vary between laboratories.

For this reason, your DHT result should always be compared with the reference range printed on your own lab report.

A result that is higher or lower than the listed range does not automatically mean you have a specific disease. It must be interpreted by a doctor in relation to your symptoms and other test results.

What Do High DHT Levels Mean?

High DHT levels may suggest increased androgen activity or increased production of dihydrotestosterone. This may be seen in some cases involving hair loss, acne, unwanted hair growth, or hormone-related symptoms.

In pattern hair loss, the issue is not always simply high DHT in the blood. Some people may have hair follicles that are genetically more sensitive to DHT, even when their blood DHT level is not extremely high.

This is why high DHT should not be used as a final diagnosis. It is a useful marker that requires proper medical interpretation.

What Do Low DHT Levels Mean?

Low DHT levels may be related to reduced androgen activity, lower testosterone levels, certain medications, or conditions that affect the conversion of testosterone into DHT.

Low DHT may also be seen in people taking medications that reduce 5-alpha reductase activity, such as some treatments used for hair loss or prostate enlargement.

A low result should be interpreted based on the reason for testing, symptoms, medication history, testosterone levels, and other hormone results.

Causes of Low DHT Levels

Possible causes of low DHT levels include:

• Low testosterone levels.
• Reduced 5-alpha reductase enzyme activity.
• Use of medications that lower DHT.
• Testicular or ovarian hormone disorders.
• Pituitary gland disorders.
• Age-related hormonal changes.
• Chronic illness or severe nutritional deficiency.

Low DHT is not always dangerous, but it should be reviewed by a healthcare provider if it is outside the laboratory reference range.

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Tests That May Be Requested Alongside a DHT Test

A Dihydrotestosterone test is often not enough on its own to fully understand hair loss or hormonal symptoms. Your doctor may request additional blood tests depending on your condition.

Common tests that may be ordered with a DHT test include:

• Total Testosterone.
• Free Testosterone.
• SHBG.
• LH.
• FSH.
• Prolactin.
• TSH and thyroid function tests.
• Ferritin or iron stores.
• Complete Blood Count, also known as CBC.
• Vitamin D.
• Other hormone or nutritional tests depending on your symptoms.

The right combination of tests should be selected by a healthcare provider. Ordering many tests without medical guidance may not be helpful and can lead to confusion.

DHT and testosterone: What Is the Difference?

Testosterone is the main androgen hormone in the body. DHT is produced when testosterone is converted into dihydrotestosterone by the 5-alpha reductase enzyme.

DHT is considered more potent than testosterone in certain tissues. This means it can have a stronger androgenic effect in areas such as the skin, scalp hair follicles, and prostate.

In simple terms, testosterone is the main source hormone, while DHT is a stronger derivative that may have a more direct effect on specific tissues.

However, DHT is not always harmful. It has normal functions in the body. Problems may occur when DHT levels are abnormal or when certain tissues are highly sensitive to it.