Full Blood Count (FBC)

Why do we test the Full Blood Count?

The FBC is used as a broad screening test to check for such disorders as anaemia, infection, and many other diseases.

If a patient is having symptoms associated with anaemia, such as fatigue or weakness, or has an infection, inflammation, bruising, or bleeding, then the doctor may order a FBC to help diagnose the cause. Significant increases in WBCs may help confirm that an infection is present and suggest the need for further testing to identify its cause. Decreases in the number of RBCs (anaemia) can be further evaluated by changes in size or shape of the RBCs to help determine if the cause might be decreased production, increased loss, or increased destruction of RBCs. A platelet count that is low or extremely high may need further investigation.

Factors that may affect your Blood Count

Many conditions will result in increases or decreases in the cell populations. Some of these conditions may require treatment, while others will resolve on their own. Some diseases, such as cancer (and chemotherapy treatment), can affect bone marrow production of cells, increasing the production of one cell at the expense of others or decreasing overall cell production. Some medications can decrease WBC counts, and some vitamin and mineral deficiencies can cause anaemia. The FBC test may be requested by the doctor on a regular basis to monitor these conditions and drug treatments.

Red Blood Cells, White Blood Cells & Platelets

Your blood contains three main components — red blood cells, white blood cells, and platelets — all suspended in fluid, called plasma.

Red blood cells contain the protein haemoglobin. Haemoglobin is a protein containing iron which can be found in all the red blood cells. It givs the blood cells their characteristic red colour. Haemoglobin allows the red blood cells to bond with oxygen in the lungs and carry that oxygen to tissues and organs throughout your body.

White blood cells are an important part of the body's immune system. They help protect against infections and also play a role in inflammation, allergic reactions, and protection against cancer. The number of white blood cells indicates the concentration of white blood cells in a person's blood sample. It is a test that includes, among other things, a full blood status that is often used in a general evaluation of a person's health.

Platelets (PLT) are small fragments of cells that are essential to normal blood coagulation. A platelet examination can be used to screen for or diagnose various disorders and conditions that can cause blood-clotting problems.

Available at our clinic locations

Also available in our most comprehensive test Blood Test XL.

The following markers are included in the full blood count


How Werlabs works

Werlabs offers health checks via blood analysis in collaboration with NHS and UKAS accredited labs. Order blood tests that suit your needs and then go to a local NHS clinic or schedule a home visit, anywhere in the UK. Expect your first results within 24 hours.

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