HEALTH TOPICS / HAIR LOSS

Hair loss - what can a blood test show?

Most people lose around 100 hairs a day. If you lose more, a blood test can find or rule out some of the causes that can be measured. No referral, at our clinic in Copenhagen.

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Why do we lose hair?

According to the Danish patient handbook on sundhed.dk, it is normal to lose around 100 hairs a day. The most common cause of hair loss is hereditary - in men as a receding hairline and thinning on the crown, in women most often as more even thinning.

Hair loss can also start about three months after a serious illness, a pregnancy or rapid weight loss. It affects the whole scalp, and for most people it improves again after a few months.

According to the patient handbook, blood tests can rule out iron deficiency, protein deficiency and hormonal disorders, among others. Hereditary hair loss cannot be seen in the blood.

What a blood test can measure

Iron

Ferritin and iron

Ferritin shows your body's iron stores. Relevant with heavy periods, after a pregnancy or with a plant-based diet.

Iron deficiency - symptoms and blood test (in Danish) →

Thyroid

TSH, T3 and T4

Both an underactive and an overactive thyroid can affect your hair. TSH is the first marker.

What TSH, T3 and T4 tell you →

Hormones

Sex hormones

A snapshot of testosterone, oestradiol and prolactin, among others. The time in your cycle affects the result.

When should a hormone test be taken? →

Protein

Protein (total)

Can be chosen in the build-your-own package if you want your protein level measured.

Build your own package →

Our suggestions

A good place to start

Basic blood test package

Haemoglobin, ferritin, B12, thyroid (TSH), long-term blood sugar and cholesterol - plus kidney and liver values - in one test.

DKK 1,599

Book a time
Iron

Iron package

Full iron status, showing both whether you are short of iron and how far it has progressed.

DKK 749

Book a time
Thyroid

Thyroid

TSH, T3, T4 and free T4 in one package.

DKK 699

Book a time
Hormones

Hormone package

Testosterone, oestradiol, prolactin, LH and FSH in one test - progesterone can be added.

DKK 849

Book a time

These packages do not require fasting, and you can book whenever it suits you. We take blood tests from people aged 18 and over.

When should you see a doctor?

If you have patchy hair loss, heavy or persistent hair loss, or it affects you a lot, talk to your own GP. If you have scaly or inflamed patches on your scalp, contact your doctor straight away.

We do not make diagnoses or treat hair loss. If a value is outside the normal range, we recommend that you follow up with your own GP.

Just given birth? Read about blood tests after the birth →

Not sure what to choose?

Take the guide - ten short questions, and you have a suggestion. Or call +45 70 20 22 32.

Start the guide - 2 min.

NurseCare offers blood tests without a referral at the clinic at Rømersgade 3 in Copenhagen K - including the basic blood test package, the iron package, the thyroid package and the hormone package, which can find or rule out some of the measurable causes of hair loss. The sample is taken by experienced healthcare professionals, and you get your results on sundhed.dk, usually within 1-3 working days.

Book a blood test  See all blood tests

Frequently asked questions

According to the Danish patient handbook, it is normal to lose around 100 hairs a day. Hair grows about 1 cm a month.

Sometimes. Blood tests can find or rule out iron deficiency, thyroid disorders and hormonal disorders, among others. The most common cause of hair loss is hereditary, however, and that cannot be seen in the blood.

The basic blood test package is a good place to start, because it measures ferritin and thyroid function (TSH), among others. To go further, choose the iron package, the thyroid package or the hormone package.

Yes. According to the patient handbook, it is common to lose more hair about three months after a pregnancy, a serious illness or rapid weight loss. For most people, it improves again after a few months.

No. NurseCare measures and explains your numbers but does not make diagnoses or provide treatment. Treatment of hair loss is a matter for your own GP or a dermatologist.

No. You book a time yourself, without a referral, at the clinic at Rømersgade 3 in Copenhagen K. We take blood tests from people aged 18 and over.

Sources (in Danish): Patienthåndbogen: Hårtab hos kvinder · Patienthåndbogen: Hårtab. Last checked 29 September 2026.

Clinically reviewed by Sanne Bjørk, Chief Nurse · Last updated 29 September 2026
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