Haemoglobin
The oxygen-carrying part of your red blood cells.
Why it matters
Low levels are linked to feeling tired or short of breath.
Persistent fatigue despite adequate rest often signals underlying biochemical imbalance. This comprehensive panel tests blood cell counts, kidney function, electrolytes, vitamins, minerals, thyroid hormones, bone metabolism, iron levels, glucose control, and inflammatory markers to identify the specific cause—whether anaemia, hypothyroidism, nutrient deficiency, or infection. This helps to enable targeted treatment rather than guesswork.
Sample requirements
Collected by our partnered phlebotomist in your booked clinic appointment. Phlebotomy fee included in the price.
The oxygen-carrying part of your red blood cells.
Low levels are linked to feeling tired or short of breath.
The proportion of your blood made up of red cells.
Gives a quick snapshot of how oxygen-rich your blood is.
The average amount of haemoglobin in each red blood cell.
Helps show whether your red cells are well-stocked with oxygen-carrying protein.
How concentrated the haemoglobin is in your red blood cells.
Another angle on red blood cell quality, useful when looking at iron status.
The average size of your red blood cells.
Cell size can hint at iron, B12 or folate levels.
The number of red cells in your blood.
Red cells carry oxygen — too few or too many can both be a sign something's off.
A type of white blood cell.
Linked to allergic responses and how your body deals with irritants.
Immune-system white blood cells.
Shows how your body is responding to infections or viruses.
A white blood cell linked to allergies and parasites.
Higher levels can be a sign of allergies or other immune activity.
A clean-up white blood cell.
Gives insight into longer-running immune activity.
Your front-line infection-fighting white blood cells.
Often higher when your body is fighting something off.
The total count of immune cells in your blood.
A general marker of how active your immune system is.
Tiny cells that help your blood clot.
Low or high counts can be a sign your clotting balance is off.
A waste product cleared by your kidneys.
A core marker for how well your kidneys are filtering.
An estimate of how well your kidneys are filtering.
A simple summary score for kidney function.
An electrolyte that keeps your body's fluids balanced.
Useful alongside sodium and potassium for hydration and kidney insight.
An electrolyte your heart and muscles rely on.
Both low and high levels can affect how you feel.
A mineral that works with calcium for bones and energy.
Levels can shift with diet, kidney function or bone activity.
Your main fluid-balance electrolyte.
Linked to hydration, blood pressure and kidney health.
A waste product from breaking down protein.
Another check on kidney filtering and hydration.
A more sensitive kidney filtering marker.
Picks up smaller changes than creatinine alone.
A mineral involved in energy, sleep and muscle function.
Low levels are linked to fatigue, cramps and poor sleep.
A mineral important for bones, muscles and nerves.
Useful for understanding bone health and overall nutrition.
The main protein in your blood, made by the liver.
Gives insight into liver function and overall nutrition.
The iron currently circulating in your blood.
Important for energy and oxygen delivery.
A B vitamin important for new cells and red blood cells.
Low levels can leave you feeling tired and run down.
A vitamin needed for energy, nerves and red blood cells.
Low levels can be a sign of fatigue, brain fog or nerve issues.
A vitamin you make from sunlight and get from food.
Linked to bone strength, immune function and mood. Many people in the UK run low.
The hormone that tells your thyroid how hard to work.
A first-line marker for thyroid balance.
The active form of one of your main thyroid hormones (T4).
Adds detail beyond TSH for a fuller thyroid picture.
The active form of your other main thyroid hormone (T3).
Helps show how well your thyroid signal is being used.
An immune marker linked to the thyroid.
Can be a sign your immune system is reacting to your thyroid.
Another immune marker linked to the thyroid.
Often raised when the immune system is reacting to thyroid tissue.
A marker linked to both liver and bone health.
Levels can shift when the liver is under strain or when bones are remodelling more than usual.
Your body's iron stores.
Low levels can leave you feeling tired; very high levels can be a sign of inflammation or iron overload.
How much iron your blood can carry.
Helps put your iron level in context.
The protein that ferries iron around your body.
Adds detail to the iron-status picture.
How much of your transferrin is actually carrying iron.
A useful marker for both low iron and iron overload.
Your blood sugar level at the moment of testing.
A snapshot of how your body is handling sugar right now.
Your average blood sugar over the last few months.
Useful for understanding how your body handles sugar over time.
The hormone that helps move sugar from blood into cells.
Gives insight into how hard your body is working to keep sugar in check.
A by-product of insulin production.
Shows how much insulin your own body is making.
A general inflammation marker.
Often raised when the body is fighting infection or inflammation.
This panel reports biomarker data. It does not diagnose any condition. Your results should be reviewed alongside the advice of your GP or another qualified healthcare professional.
Choose your test, complete your details and book your appointment (either through an email sent after an order with a UK partnered clinic or on our site for our own clinic).
Visit our Chxhealth Clinic in County Durham or head to one of our 50+ partnered clinics all over the UK.
ISO accredited process through our lab partners. Your sample is analysed using independently certified methods and is double checked for accuracy.
Easy-to-read results sent from us to your inbox.
Symptoms tell you something is wrong. Tests tell you what. This panel measures the biomarkers that connect to how you actually feel — so you can act with evidence, not guesswork.
Tired All The Time results are typically delivered within 3 working days of the laboratory receiving your sample. You receive a plain English PDF report.
The panel requires a venous blood draw at a Chxhealth or partner clinic. The phlebotomy fee is included in the price. Choose our Lanchester clinic or one of our 50+ UK partner and pop-up clinics when you book.
It covers the biomarkers most commonly investigated in unexplained fatigue: full blood count, ferritin and iron status, thyroid markers, vitamin B12 and folate, vitamin D, liver and kidney function, and inflammation markers.
Morning is generally preferred. Hydrate well the day before, avoid strenuous exercise for 24 hours, and book the earliest available slot if testing thyroid alongside.
No. Chxhealth is a biomarker and genetic data provider. We do not diagnose, treat or prescribe. For medical advice, please speak to a qualified healthcare professional. The panel surfaces biomarkers commonly linked to fatigue. Any out-of-range result should be discussed with your GP for clinical assessment.
Lab-validated, expert-reviewed, in your inbox in days.