What causes low energy?

Low energy can be caused by a lack of sleep, stress, lifestyle factors like an unbalanced diet high in ultra-processed foods, hormonal changes, a vitamin deficiency or an under-active thyroid (hypothyroidism).

What vitamins give you energy?

The following vitamins and minerals are important factors in energy: B vitamins Vitamin D Vitamin C Ferritin Magnesium

Does perimenopause cause low energy levels?

When oestrogen levels drop sharply during perimenopause, this can have an impact on your energy levels.

Do female hormones affect tiredness?

The unique and complex fluctuation of female hormones has an impact on energy levels due to the importance these hormones have in the normal function of our body’s systems. During perimenopause, reducing levels of various hormones can impact a woman’s levels of fatigue. It is important to check for hormonal imbalances on a regular basis.

How soon will the test arrive?

If you order your test before midday on a Monday to Friday then your kit will be dispatched the same day. All our kits are sent out via Royal Mail first class post, so it should be with you within 1-2 working days.

How secure is my data?

We have strict processes in place to ensure the protection of your data. Following GDPR the company also operates under tight legal rules about the sharing of data which ensures that data is only shared if it is crucial to the delivery of our service. For example, our doctors see customer results at the time of review, however, after review, access to results is withdrawn.

Can I have someone take my blood for me?

Yes. We offer two options if you do not want to do our finger prick test. The first is a home appointment where a nurse comes to your home to take a blood sample. The second is to visit a Phlebotomy clinic near you that offers a blood sample service. A blood sample will be taken from your vein and we will provide you with everything you need to give to the nurse to allow them to take the sample. The nurse will give you the blood sample to return to us using the pre-paid envelope provided.

Does a doctor review my results?

We have a team of doctors and nurses who look at all results and will comment on any results that are outside of the normal range for your age.

Can I download the results to share with my GP?

Yes, you can download your results from your health dashboard as a PDF to share with your GP.

Get a £5 voucher for you or to pass on when you order this test today.

Tiredness & Fatigue Blood Test

Name: Tiredness & Fatigue Blood Test
Brand: Forth
Price: 85 GBP
Availability: InStock
Rating: 4.2 (1168 reviews)

Are you feeling tired all the time, low on energy or fatigued? Our test is a great place to start. It checks your thyroid, along with vitamin D, vitamin B12 and ferritin which all play a role in energy production. A thyroid condition or deficiency in these vitamins can leave you feeling tired or fatigued.

£85

+ £5 Voucher when you order today

Or 3 Interest-free payments

Certified for quality & security

What does a Tiredness & Fatigue blood test check?

This test is a great starting point to find out the cause of constant tiredness, low energy, and fatigue. Testing thyroid stimulating hormone levels, along with vitamin D, vitamin B12 and iron (ferritin) can identify or rule out some of the potential causes. If you want a more comprehensive check, we recommend our Advanced Energy Test.

How to test energy levels at home

You can test your energy levels and find out why you’re tired all the time from the comfort of your home with our Tiredness & Fatigue blood test. The test kit includes everything you need to collect a sample of blood from your finger and post it back to our labs for analysis. Our medical team will review your results, offering comments and advice based on your hormone levels.

Frequently asked questions

This is what our customers ask us most about this test. For more information, try our help centre.

What causes low energy?

Low energy can be caused by a lack of sleep, stress, lifestyle factors like an unbalanced diet high in ultra-processed foods, hormonal changes, a vitamin deficiency or an under-active thyroid (hypothyroidism).
What vitamins give you energy?
The following vitamins and minerals are important factors in energy:
- B vitamins
- Vitamin D
- Vitamin C
- Ferritin
- Magnesium
Does perimenopause cause low energy levels?

When oestrogen levels drop sharply during perimenopause, this can have an impact on your energy levels.
Do female hormones affect tiredness?

The unique and complex fluctuation of female hormones has an impact on energy levels due to the importance these hormones have in the normal function of our body’s systems.

During perimenopause, reducing levels of various hormones can impact a woman’s levels of fatigue. It is important to check for hormonal imbalances on a regular basis.
How soon will the test arrive?

If you order your test before midday on a Monday to Friday then your kit will be dispatched
the same day.

All our kits are sent out via Royal Mail first class post, so it should be with you within 1-2
working days.
How secure is my data?

We have strict processes in place to ensure the protection of your data. Following GDPR the company also operates under tight legal rules about the sharing of data which ensures that data is only shared if it is crucial to the delivery of our service. For example, our doctors see customer results at the time of review, however, after review, access to results is withdrawn.

Learn more about your data security.

Can I have someone take my blood for me?

Yes. We offer two options if you do not want to do our finger prick test. The first is a home appointment where a nurse comes to your home to take a blood sample. The second is to visit a Phlebotomy clinic near you that offers a blood sample service.

A blood sample will be taken from your vein and we will provide you with everything you need to give to the nurse to allow them to take the sample.

The nurse will give you the blood sample to return to us using the pre-paid envelope provided.
Does a doctor review my results?

We have a team of doctors and nurses who look at all results and will comment on any results that are outside of the normal range for your age.
Can I download the results to share with my GP?

Yes, you can download your results from your health dashboard as a PDF to share with your GP.

Learn how to export your results.

We are dedicated to supporting you on improving your health

Recommended by doctors

Dr Thom Phillips

Clinical Lead

BSc. (Hons) MSc. MB BCh. MRCGP. Dip SEM. PGCert (Diabetes)

Renee McGregor

Nutrition Lead

BSc (hons) PGDIP (DIET) PGCERT(sportsnutr) RD BASES

Dr Michael Cornes

Scientific Officer

Consultant clinical scientist, FRCPath, BSc Biochemistry, MSc Clinical Biochemistry, PhD Biochemistry

"Our Tiredness & Fatigue Blood Test helps uncover underlying causes of persistent exhaustion. It evaluates factors like anaemia, thyroid function, and nutrient deficiencies. Identifying the root cause enables targeted treatment, addressing fatigue and restoring energy levels, so you can enjoy a more active life."

Dr Thom Phillips

We’re changing people’s lives

I really like Forth and you probably saved my life because your lab discovered my critically low cortisol which was subsequently diagnosed as adrenal insufficiency by a hospital endocrinologist.

Maria

I find Forth professional and forward-thinking with a bigger range of tests than more traditional healthcare providers in the UK. I think it is closer to what you can get from US providers.

Richard C

I wanted to get more information about my own health instead of using the NHS who just test for a specific reason. I also wanted better historical data to view changes over time as the NHS systems aren’t very good for that.

James W

Finding out what is going on inside your body is key, especially now that the NHS is in crisis. If we can take control of our wellness (and flag up potential problems early) that has got to be a good thing.

Vannesa C

I am very satisfied with your excellent service and I have recommended you to all my friends who are also very interested in your products.

Doris R

How it works

Getting the insights you need to improve your health has never been easier.

1. Choose your blood test

No need to wait for a GP appointment, choose from our wide range of tests which come with everything you need to take your sample and return to our lab.

2. Collect your sample

Take your finger prick blood sample at home, or choose to have your blood taken at a Superdrug health clinic or a nurse at home. Return to our NHS lab using our prepaid envelope.