What blood tests are done for tiredness?

NICE guidance lists tests a GP may consider, including a full blood count, ferritin, kidney function, thyroid function, HbA1c and CRP. This panel includes those and adds vitamin B12, folic acid, vitamin D and minerals such as magnesium and phosphate.

When should I see a GP about tiredness?

NHS advice is to see a GP if you have been tired for a few weeks and do not know why, if it is affecting your daily life, or if you have other symptoms such as weight loss or changes in mood. You can share your results from this test with your GP.

Do I need to fast for a tired all the time blood test?

No. You can eat and drink normally beforehand. Just tell us when you last ate so the doctor can interpret your glucose and insulin results.

Tired All The Time Blood Test at Jace Medical

Energy & nutrition

Private blood test

Tired All The Time Blood Test

Checks a wide range of common medical causes of ongoing tiredness and low energy.

44 biomarkers
No fasting needed

£179Includes sample collection

Book this test Ask a question

We confirm your appointment and any preparation, such as fasting, before you attend.

What’s included

44 biomarkers in this test.

No fasting needed

Blood sugar & diabetes4

How your body manages sugar, including your average level over recent months.

C-peptide
Glucose
Insulin
HbA1c

Liver2

Enzymes and proteins that show how well your liver is working.

Albumin
Alkaline Phosphatase (ALP)

Kidneys4

How well your kidneys filter waste from your blood.

Creatinine
Cystatin C
Estimated Glomerular Filtration Rate (eGFR)
Urea

Body salts & minerals6

Electrolytes and minerals that help your nerves, muscles and heart work properly.

Calcium (adjusted)
Chloride
Magnesium
Phosphate
Potassium
Sodium

Iron & anaemia5

Your iron levels and stores, a common cause of tiredness when low.

Ferritin
Iron
Total Iron Binding Capacity (TIBC)
Transferrin
Transferrin Saturation

Vitamins3

Key vitamins for energy, nerves, bones and healthy blood.

Folic acid
Vitamin B12
Vitamin D

Blood count14

Your red cells, white cells and platelets.

Full Blood Count
Eosinophil Count
Lymphocyte Count
Neutrophil Count
White Blood Cell Count
Platelet Count
Haemoglobin
Haematocrit
Mean Cell Haemoglobin
Mean Cell Haemoglobin Concentration
Mean Cell Volume
Red Blood Cell Count
Basophil Count
Monocyte Count

Thyroid5

How well your thyroid is working, and antibodies linked to thyroid conditions.

Anti-Thyroglobulin Antibody (Anti-Tg)
Anti-Thyroid Peroxidase Antibody (Anti-TPO)
Free Thyroxine (FT4)
Free Tri-iodothyronine (FT3)
Thyroid Stimulating Hormone (TSH)

Inflammation & immunity1

Signs of inflammation in the body and how your immune system is working.

C-Reactive Protein (CRP)

About this test

Is the Tired All The Time Blood Test right for you?

Who it’s for

You have felt tired or low in energy for several weeks and do not know why.
You want to check several common physical causes of tiredness, such as anaemia, low iron, thyroid problems and raised blood sugar, from one sample.
Your tiredness comes with other symptoms, such as shortness of breath, pale skin, feeling cold, being very thirsty or weeing more than usual.
You have heavy periods or follow a vegan or restricted diet, which can make low iron or low vitamin B12 more likely.

What it can show

The full blood count, ferritin and iron studies (iron, transferrin, TIBC and transferrin saturation) can show anaemia and whether your iron stores are low. Vitamin B12 and folic acid can show other common causes of anaemia and tiredness.
TSH, free T4 and free T3 show how well your thyroid is working. Thyroid antibodies (anti-TPO and anti-Tg) can show whether the immune system may be affecting it.
HbA1c and glucose can show whether your blood sugar is raised, as it is in diabetes. Insulin and C-peptide give more detail on how your body is handling sugar.
Creatinine, cystatin C, eGFR and urea show how well your kidneys are working, and sodium, potassium and chloride check your body’s salt balance.
CRP is a general marker of inflammation or infection. Calcium, phosphate, magnesium, ALP, albumin and vitamin D give information about bone and mineral health.

What it can’t tell you

Tiredness is very common and often has no single physical cause. Poor sleep, stress, low mood and lifestyle factors are common causes that a blood test cannot measure.
Normal results do not rule out every cause. This panel does not include some tests a GP may consider for tiredness, such as a full set of liver function tests, a coeliac disease test or creatine kinase.
Some results need context. Infection or inflammation can raise ferritin even when iron is low, and glucose and insulin are a snapshot of the moment the sample was taken.
One result is a snapshot, and borderline results may need repeating before any decision is made.
Results are interpreted alongside your symptoms. If something needs investigating or treating, this is done with your GP or a specialist.

Before your test

You do not need to fast. Eat and drink as normal, and tell us when you last ate, as this helps the doctor interpret your glucose and insulin results.
Biotin (vitamin B7), found in some hair, skin and nail supplements, can affect some hormone and thyroid results. Tell us if you take it, and if you take a high dose (5mg or more a day), stop it for a week before your test if it is safe to do so.
Tell us about any medicines or supplements you take, including iron, vitamin B12, vitamin D or thyroid medicine. Keep taking prescribed medicines unless your doctor has told you otherwise.
If you have a cold or other infection, consider booking once you have recovered, as infection can affect inflammation and iron results.

Your results

Usually within a couple of working days. We email your results once a doctor has reviewed them.

How it works

From booking to results in three steps.

Step 1
Request your test
Send a booking request online or call us. We confirm your clinic, appointment time and any preparation.
Step 2
Visit the clinic
A short appointment for professional sample collection at Greysteel or Letterkenny. No GP referral needed.
Step 3
Receive your results
Usually within a couple of working days, emailed to you once a doctor has reviewed them.

Common questions

Questions about this test.

It can show common physical causes of tiredness, such as anaemia, low iron, an underactive or overactive thyroid, or raised blood sugar. Many people with tiredness have normal results, because causes such as poor sleep, stress and low mood do not show up in blood tests.