A panel built specifically for unexplained tiredness, covering the treatable causes that routine testing often misses.
Referred by a GMC-registered GP, results reviewed by the same doctor
Taken at a partner site near you
Results explained in plain English, not just a number
Your NHS records in the room, with your consent
Care led personally by Dr Khan
Attentive, unhurried care that listens properly
Five-star Google reviews from the people we have looked after
Registered with the Care Quality Commission
"Tired all the time" is one of the commonest reasons people see a GP, and one of the most frequently dismissed. It gets attributed to stress, to age, to having young children, to working too hard — and sometimes that is right.
Often it is not. Iron deficiency, an underactive thyroid, B12 deficiency, vitamin D deficiency and early diabetes all present as fatigue long before anything else, and all are straightforward to treat once identified.
This panel tests for them together, because they overlap and because testing one at a time wastes months.
The treatable causes of fatigue, in a single sample. It is deliberately broader than the tests usually run for tiredness, and deliberately narrower than a full health check — it is built for one question.
Persistent tiredness that sleep does not fix. Difficulty concentrating or brain fog. Breathlessness on stairs you used to manage. Feeling cold when others do not. Hair thinning or shedding. Low mood without an obvious cause.
It is also worth considering if you have already been tested elsewhere, told everything was normal, and still feel unwell — basic testing often covers only a fraction of what is on this panel.
Twenty minutes to take a proper fatigue history. This matters more than it sounds — the pattern of tiredness often points to the cause before any blood is taken.
You attend a Randox Health clinic for the sample.
Not a set of numbers by email. A GP goes through what was found, what it explains, and what to do about it.
A morning sample after an overnight fast is preferred, for accurate glucose and iron results. Water is fine.
Stop iron supplements 48 hours beforehand. If you take B12 supplements or have had recent injections, tell the GP — both make the result harder to interpret. Biotin supplements distort thyroid results and should be stopped 48 hours before.
In practice the commonest findings are, roughly in order: iron deficiency, vitamin D deficiency, thyroid disease, B12 or folate deficiency, prediabetes, and coeliac disease.
Together those account for a large proportion of the people who come in exhausted with no obvious explanation — and every one of them is treatable.
You can be significantly iron deficient with a completely normal full blood count and no anaemia. Ferritin is what shows it, and it is the test most often left out.
A ferritin in the low end of "normal" frequently causes real fatigue, particularly in menstruating women — and treating it makes a genuine difference. A haemoglobin that is fine is not the same as iron stores that are fine.
It does not mean nothing is wrong. That deserves saying directly, because it is where a great many people get stuck.
The commonest causes of persistent fatigue do not show up in blood at all:
Normal bloods narrow the field. They do not close the case.
Unintentional weight loss, drenching night sweats, new lumps, or fatigue that is worsening rapidly need urgent assessment rather than a routine screen — and should go through your NHS GP, who can refer on an urgent pathway.
It excludes the treatable medical causes. That is genuinely valuable — but excluding them is not the same as explaining the fatigue.
A normal result should move the conversation on to sleep, mood and life circumstances, not end it.
"Adrenal fatigue" testing has no basis — the condition is not recognised, and salivary cortisol panels sold to diagnose it are not valid. Genuine adrenal insufficiency is a real and serious diagnosis, made differently, and it is rare.
Also without value here: food intolerance panels, hair mineral analysis, and "chronic fatigue" supplement protocols.
Examine you — which matters for lymph nodes, thyroid and abdominal findings. Where anything in the history suggests it, you need seeing in person.
This is exactly what an NHS GP investigates, free — and "tired all the time" is one of the commonest reasons people see one. The standard NHS panel covers most of what is here.
If you can get an appointment, start there. What we offer is speed and the time to go through it properly, not a better blood test.
Free vitamin D supplements are available for some groups, and NHS Talking Therapies takes self-referrals without a GP — worth knowing, because depression is a commoner cause of fatigue than most people expect.
Twenty minutes. Fatigue is the symptom most poorly served by a ten-minute appointment, because the useful part is the history — sleep, mood, alcohol, medication, weight, periods, and what changed and when.
That conversation finds more answers than the panel does.
A morning fasted sample is preferred.
Stop iron supplements 48 hours beforehand, as they falsely raise the reading, and stop biotin 48 hours beforehand — it interferes with thyroid assays and can produce results that look like thyroid disease when there is none.
Tell us if you take B12 supplements, because they make that result uninterpretable.
Because the commonest causes of fatigue do not appear in blood.
Sleep apnoea, depression, chronic insufficient sleep, post-viral fatigue and ME/CFS all run with entirely normal results — and every one is real.
Normal bloods narrow the field. They do not mean nothing is wrong, and they are not where the conversation should stop.
Iron deficiency, by some margin — then vitamin D deficiency, thyroid disease, B12 or folate deficiency, prediabetes and coeliac disease.
All treatable, which is the point of looking.
Yes — and this is the single most useful thing on this page.
Iron deficiency without anaemia is common and causes genuine fatigue, particularly in menstruating women. Ferritin shows it; a full blood count does not.
A ferritin at the low end of the reference range is frequently worth treating.
Possibly, and it is checked. Thyroid antibodies matter too — they can indicate autoimmune thyroid disease before TSH becomes abnormal.
And stop biotin 48 hours before, or the thyroid results may be wrong in a way that looks convincing.
It is not a recognised diagnosis, and the tests sold to diagnose it are not valid.
Genuine adrenal insufficiency — Addison's disease — is real, serious and rare, and diagnosed quite differently. We would test for it where the picture actually fits.
Very possibly, and it is substantially underdiagnosed — particularly in women, where it presents as fatigue, insomnia and low mood rather than loud snoring.
Worth asking about if you wake unrefreshed however long you sleep, or if a partner has noticed pauses in your breathing. It needs a sleep study, and NHS referral is free.
Yes, and it is one of the commonest causes. Depression causes profound physical exhaustion, not only low mood.
NHS Talking Therapies accepts self-referrals without going through a GP, and it is free.
Unintentional weight loss, drenching night sweats, new lumps, or fatigue getting rapidly worse.
Those need urgent assessment through your NHS GP, who can refer on an urgent pathway. Do not route that through a private blood test.
Clinically reviewed by Dr Mohammad Zubair Khan, GMC 7563469
Last reviewed
August 23, 2026
On this page
Ongoing
Time to be seen
Appointment length
Your NHS record in the room
Written treatment plan
Told when a test isn’t needed
Cost
Same day, usually
20 minutes
Yes, with your consent
Included
Yes, and told why
£40 for 20 minutes
Varies by practice
Typically 10 minutes
Yes, your full record
Not routinely
Usually
Free
Same day
Often 10 to 15 minutes
Usually not
Sometimes charged
Varies by provider
Often a subscription
Same-day access is usually available, from 6am to 10pm, seven days a week. You choose a time that suits you rather than waiting on hold at 8am.
Yes. Care is led personally by Dr Mohammad Khan, so you are not passed between clinicians. Continuity is the point of a small practice: someone who knows your history and is listening attentively rather than working through a checklist.
Yes, with your consent. We can access your Summary Care Record during the consultation, so your current medications, allergies and significant history are in the room. That means fewer questions you have already answered elsewhere, and safer prescribing.
No. We are not here to replace GPs, only to support them. Your NHS practice remains responsible for your ongoing care, and with your consent we write to them after the consultation. We are useful when you need to be seen sooner, or want more time than a standard appointment allows.
Twenty unhurried minutes and a comprehensive assessment. A written treatment plan is included, along with any prescription, sick note or referral letter arising from the consultation, at no extra charge.
£40 for 20 minutes, self-pay. Membership is optional and never required. Priced for fairness, because we are not here to charge extortionate amounts for access to a doctor.
It means the diagnosis can usually be made from your history and photographs, and that treatment can be arranged safely without examining you. Where a condition is not marked treatable online, it is because examination is the diagnosis — listening to a chest, feeling an abdomen, examining an ear or a joint — or because a procedure or device is needed.
Yes, where there is a genuine bacterial infection — cellulitis, impetigo, bacterial urine infections, confirmed strep throat. We will also frequently tell you that you do not need one. Most sore throats, coughs, colds and earaches are viral, and an antibiotic gives you the side effects with none of the benefit.
If your problem turns out to be genuinely outside what we can do remotely, the doctor will tell you straight away, point you to the right service, and refund your fee in full. We would rather do that than fill twenty minutes to justify the charge.
Call 999 or go to A&E — do not book an online appointment and do not wait for a reply to an email. For urgent problems that are not emergencies, NHS 111 is available 24 hours a day, online or by phone, and can direct you to the right service.
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