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The blood consists of three main components; the red blood cells, the white blood cells and the platelets. The platelets are suspended in a fluid known as the plasma. These blood components have their different functions in the body, and the availability or reduced availability in the body might be detrimental, which is why we carry out the full blood count from time to time.

At the Blood London Clinic, we carry out over a thousand blood tests and full blood count is not an exception.

Are you looking for a clinic where you will get quality and affordable services from experienced medical experts?
If this is you, then put a call through to 020 71830244 to book an appointment for your full blood test.

Functions Of The Main Blood Count Test Components

  • White Blood Cells

The white blood cells, like soldiers, protect the body against harmful substances that find their way into the body.

  • Red Blood Cells

The red blood cells carry the haemoglobin. The haemoglobin is responsible for carrying oxygen to the tissues of the body

  • Platelets

Platelets are responsible for a blood clot. When there are broken points on the body, the platelets cover the broken points and heal the damaged blood vessels.

Full Blood Count

A full blood count is used to check for disorders in the blood. It could be anaemia, leukaemia, sickle cell or any other blood disease. Aside from diagnosing medical conditions, full blood count is useful for other purposes.

Don’t hesitate to put a call across to us in order to diagnose your medical condition!

Uses Of Full Blood Count

A full blood count is carried out for several reasons, which include the following:

  • Diagnosing A Medical Condition

When you notice symptoms like fever, fatigue, inflammation, weakness or tiredness, or even bleeding, different options come to mind. A complete blood count will confirm what the problem is, by evaluating the signs and determining the cause.

  • Monitoring A Medical Condition

If you have been diagnosed with a blood disorder, through blood count probably, the same blood count is useful for improvements and reactions to medications.

  • Monitoring Medical Treatment

Blood count can be used to monitor your health status based on the medications you need to take.

  • Reviewing Overall Health

A full blood count is used for general routine examinations, like checking the health status of a patient and looking out for signs of diseases like leukaemia or anaemia.

What Happens During A Full Blood Count?

Full blood count requires screening the various components of the blood for possible signs of disease. These components are;

Red blood cell count

The number of red blood cells in the blood has a specified range. During full blood count, the actual number observed is taken down and evaluated. Increase in expected number or decrease in the exact amount of red blood cells indicates abnormal medical conditions.

White Blood Cell Count

This is the actual counting of the white blood cells per volume of blood. Increase or decrease in the expected outcome of white blood cells indicates a medical problem.


The actual number of platelets in the volume of blood is determined using a full blood count. Anything above or below the appropriate number can indicate problems like bleeding or disorders of the bone marrow.

Differential White Blood Cell

There are about five different types of white blood cells. During a full blood count, the different types of white blood cells are taken into consideration. These are the different types of white blood cells – lymphocytes, basophils, monocytes, neutrophils and eosinophils.

Red Blood Cell Distribution Width

This is the calculation of the variations in the size of red blood cells


This is a measurement of the number of proteins that carry oxygen in the blood.

Preparing For A Full Blood Count

If you are only getting a blood count, then there is no need to fast before the test. However, if additional tests are to be carried out, you might have to fast for a specified period before the test.

Our medical experts will let you know if you should fast or not.

Collecting Samples For The Test

A needle is inserted in the vein of the arm to collect the blood sample. It can also be by finger pricking. At Blood London, we take great care in doing a full blood count for our clients.

Possible Indications From A Full Blood Count Result

The sole aim of having a full blood count is to search for problems. Nonetheless, it is not expected and can be sad when there is a flaw in the results because it indicates an underlying problem. Outlined below are some examples

Red Blood Cell Count

Haemoglobin, Hematocrit and the red blood cell count all make up the red blood cell. A decrease in the normal rate in each of these areas indicate anaemia

An increase in red blood cell count, higher than usual indicates a Polycythemia vera or heart disease

White Blood Cell Count

A lower than normal white blood cell count is a possible indication of an autoimmune disease, cancer or bone marrow problems. All these lead to a drop in the white blood cells count.

On the other hand, a higher than normal white blood cell count indicates infection, inflammation, bone marrow disease or immune system disorder. It could also be a result of a reaction to a medication

Platelets Count

An out of place platelets count, whether higher or lower can be a side effect of medication. Also, it can be a sign of an underlying medical disorder.

You will have to undergo additional tests to verify and confirm the actual problem if your full blood count result is high or low.

Having a full blood count prepares you for any medical problems you might have. It clears out any suspicions you might have concerning symptoms you may have been experiencing. Call us today at Blood London on 02071830244 or send us an email for any advice you might need on full blood count. You can also book an appointment

Blood London have been providing Full Blood Count Test London on a self-referral basis to patients in Central and Greater London for over 20 years. Simply walk-in weekdays between 9am and 6pm or on weekends between 10am and 2pm, to have your blood taken by a highly experienced professional in our private, Harley Street clinic using some of the best labs in europe.

Please note that when ordering blood tests on a self-request basis, we will forward you the laboratory report without note or comment from our doctors unless you are under their care.

Following the results of your test, if you would like to undergo a consultation, further testing or treatment please feel free to reach out to the clinic and we'll be happy to help.

How Blood London Works

Order your test

Order your test

Select the test that you would like to undergo

Provide your sample

Provide your sample

Go to the Harley Street clinic for your blood draw and pay for your test in person

View your results

View your results

As soon as the results are ready, the will be sent to you by your chosen method

World class partner lab (TDL)

World class partner lab (TDL)

Advice from expert UK doctors

Advice from expert UK doctors

Repeat your tests and track your improvements!

Repeat your tests and track your improvements!

Comprehensive Blood Testing