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Low levels are linked to feeling tired or short of breath.

Gives a quick snapshot of how oxygen-rich your blood is.

Helps show whether your red cells are well-stocked with oxygen-carrying protein.

Another angle on red blood cell quality, useful when looking at iron status.

Cell size can hint at iron, B12 or folate levels.

Red cells carry oxygen — too few or too many can both be a sign something's off.

Linked to allergic responses and how your body deals with irritants.

Shows how your body is responding to infections or viruses.

Higher levels can be a sign of allergies or other immune activity.

Gives insight into longer-running immune activity.

Often higher when your body is fighting something off.

A general marker of how active your immune system is.

Low or high counts can be a sign your clotting balance is off.

A long-standing marker for heart and circulation health.

Higher levels are linked to a greater chance of furred-up arteries over time.

Higher levels are generally linked to better heart health.

A simple ratio that gives a clearer picture than total cholesterol alone.

Linked to diet, weight and heart health — often respond well to lifestyle tweaks.

Gives a more direct read on artery-clogging particles than LDL alone.

High levels can be a sign of inherited heart-health risk.

A core marker for how well your kidneys are filtering.

A simple summary score for kidney function.

Useful for understanding bone health and overall nutrition.

Useful alongside sodium and potassium for hydration and kidney insight.

Levels can shift with diet, kidney function or bone activity.

Both low and high levels can affect how you feel.

Linked to hydration, blood pressure and kidney health.

Another check on kidney filtering and hydration.

Higher levels can be a sign your liver is under stress, often linked to diet, alcohol, or fatty liver.

Levels can shift when the liver is under strain or when bones are remodelling more than usual.

Read alongside ALT, it gives extra insight into how your liver and muscles are coping.

Often raised by alcohol or fatty liver — a useful check-in on lifestyle impact.

Higher levels can be a sign your liver isn't clearing things as efficiently as usual.

Gives insight into liver function and overall nutrition.

Useful for understanding how your body handles sugar over time.

A snapshot of how your body is handling sugar right now.

Gives insight into how hard your body is working to keep sugar in check.

Shows how much insulin your own body is making.

Picks up insulin resistance years before it shows in HbA1c.

A first-line marker for thyroid balance.

Helps show how well your thyroid signal is being used.

Adds detail beyond TSH for a fuller thyroid picture.

Can be a sign your immune system is reacting to your thyroid.

Often raised when the immune system is reacting to thyroid tissue.

Linked to mood, cycle, skin and bone health.

Gives insight into reproductive hormones for both men and women.

Helps complete the reproductive-hormone picture.

Higher levels can be linked to cycle changes or fertility insight.

Linked to energy, mood, libido and muscle for both men and women.

Affects how much testosterone and oestrogen are actually active in your body.

A simple summary of androgen activity.

Linked to energy, sleep, mood and how your body handles pressure.

Important for energy and oxygen delivery.

Low levels can leave you feeling tired; very high levels can be a sign of inflammation or iron overload.

Helps put your iron level in context.

A useful marker for both low iron and iron overload.

Low levels can leave you feeling tired and run down.

Low levels can be a sign of fatigue, brain fog or nerve issues.

Linked to bone strength, immune function and mood. Many people in the UK run low.