A private full blood count (FBC), the test doctors order first: 15 markers covering your red blood cells and haemoglobin for anaemia, white blood cells for infection and immunity, and platelets for clotting. £69 at one of 250+ Goodbody clinics or £89 with a nurse home visit, no fasting and no GP referral needed. Results are emailed within 3 to 5 working days with a GP report explaining each result.
A full blood count, written FBC on NHS forms and called a complete blood count or CBC in the United States, measures the cells in your blood: red cells, which carry oxygen; white cells, which fight infection; and platelets, which help blood clot. It is the most commonly ordered blood test in the UK because so many conditions change one of those three lines, and this is the same NHS guided test your GP would order. It is done on a single tube of blood and needs no preparation.
Fifteen markers in three groups:
| Group | Markers | What they show |
|---|---|---|
| Red cells | Haemoglobin, red cell count, haematocrit, MCV, MCH, MCHC, red cell distribution width | Anaemia and its likely cause: small cells point to iron deficiency, large cells to B12 or folate deficiency or alcohol |
| White cells | Total white cells, neutrophils, lymphocytes, monocytes, eosinophils, basophils | Infection, inflammation, allergy, immune suppression, and rarely blood cancers |
| Platelets | Platelet count, MPV | Clotting: too few cause bruising and bleeding, too many can follow inflammation or iron deficiency |
Whether you are anaemic and, from the size of your red cells, why; whether your white cells are raised, which usually means infection or inflammation, or low, which can mean a viral illness, medication effect or a suppressed immune system; and whether your platelets are in range. It is the test that explains tiredness, breathlessness, pale skin, frequent infections and easy bruising more often than any other, and it is the baseline doctors want before almost any further investigation.
It cannot diagnose cancer, and a normal result does not rule it out. What it can do is show patterns that prompt investigation: unexplained anaemia is a recognised early sign of bowel and stomach cancers and is why GPs refer for it; very high or very low white cells, or abnormal cell types, can be the first sign of leukaemia or lymphoma; and low platelets alongside those changes strengthen the picture. Solid tumours such as ovarian, breast, lung or prostate cancer do not usually change a full blood count until late, so symptoms should always go to a GP regardless of the result.
Occasionally, yes, and that is why it is worth doing. Marked anaemia, a very high or very low white cell count, or very low platelets all need prompt follow-up, and your GP report will say so clearly and tell you what to do the same day. Far more often the result is normal or shows a mild, fixable problem such as iron deficiency.
No. A full blood count looks only at blood cells. Diabetes is tested with HbA1c, cholesterol with a lipid profile and thyroid with TSH and free T4, all on separate tubes. If you want those alongside your blood count, the Advanced Well Man and Advanced Well Woman tests include a full blood count with 48 or 51 markers, and the General Health test covers liver, kidney, cholesterol and iron.
Reference ranges differ between laboratories and between men and women, so there is no single set of normal numbers, and the exact range for each marker is printed beside your result on the report. Haemoglobin, for example, has a lower normal range in women than in men. Your GP report interprets every result against the laboratory's own range and your age and sex, and explains any that fall outside it, so you do not need to look anything up.
Iron, B12 and folate deficiency; heavy periods and other blood loss; chronic kidney disease; infections from a cold to glandular fever; inflammatory conditions such as rheumatoid arthritis and inflammatory bowel disease; allergies and parasites, which raise eosinophils; liver disease and heavy drinking; thalassaemia and sickle cell traits; medication effects, including chemotherapy and some antibiotics; and blood cancers. Smoking and dehydration also nudge results, which is why they are read alongside your history.
No. Sperm count, movement and shape are measured on a semen sample, not a blood test, and hormones such as testosterone, FSH and LH are separate blood tests. Our Male Fertility Home Sperm Test and Male Hormone and Fertility Blood Test cover those. A full blood count can, however, pick up anaemia or infection that affects general health and energy.
No fasting or preparation is needed, and you can take medication as normal. The test needs a tube of whole blood from a vein in the arm, which is why there is no finger-prick option. Book at one of 250+ Goodbody clinics or have a nurse visit your home for £89; the draw takes a few minutes. Find your nearest clinic.
£69 at a Goodbody clinic or £89 with a nurse home visit, including the blood draw, laboratory analysis and a GP report. Private full blood counts in the UK typically cost £50 to £90, with the draw sometimes charged separately.
Results are emailed within 3 to 5 working days of your sample reaching the laboratory, with a GP report that explains each result. If a result needs urgent attention, the report will say so and tell you what to do.
Your results and GP report are emailed to you within 3 to 5 working days of your sample reaching the laboratory. The report explains each marker in plain language, flags anything outside the reference range and says what to do next, including when to take the result to your own GP. All samples are analysed by a UKAS-accredited laboratory.
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Book online, receive your kit and take to your local Goodbody clinic.
Send your sample in the post to be analysed at an accredited laboratory.
Get your comprehensive detailed results report from the laboratory, with guidance from our support team.
Have your blood taken in-clinic by one of our skilled phlebotomists and check multiple biomarkers in one go. Many of our tests can also be done in the comfort of your own home with one of our easy-to-use test kits.
Take a test, either in the comfort of your own home, with a nurse visit, or at one of our clinics nationwide.
Your sample is analysed in the clinic, laboratory or using your home test equipment.
Get your comprehensive detailed results report from the laboratory.
Enquire via the form and a member of our team will get back to you, they are more than happy to help answer your questions and talk through the best option for you.
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BSc (Hons) MBChB
Registered GP & Lead Medical Advisor

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Clinical Support Advisor

MBCHB, MRCP, FRCR
Consultant Oncologist
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