CBC blood test: what a complete blood count shows, ranges and price

A CBC blood test, or complete blood count, counts and measures the three kinds of cell in your blood: red cells, which carry oxygen; white cells, which fight infection; and platelets, which help blood clot. It is often part of a routine check-up, and one small tube gives a broad look at anaemia, infection, inflammation and some blood conditions.

What the test includes

A modern analyser reports a long list of results from a single sample. In Clare's panel the blood count gives 21 measured results, in three groups, plus three ratios that Clare calculates from them.

The red cell side

The Red Blood Cell Count (RBC), Hemoglobin and Hematocrit describe how much oxygen-carrying capacity the blood has. The red cell indices describe the cells themselves: MCV is their average size, MCH and MCHC show how much hemoglobin each one carries, and RDW shows how much they vary in size. The indices are often what turns "low hemoglobin" into a useful next question.

The white cell side

The White Blood Cell Count (WBC) is the total. The differential splits it into five types, each reported as a percentage and as an absolute count: neutrophils, the main defence against bacteria; lymphocytes, which handle viruses and long-term immunity; monocytes, which clear debris and dead cells; eosinophils, which rise with allergy and parasites; and basophils, which release chemicals during allergic reactions. The analyser also counts immature granulocytes, white cells released into the blood before they finished maturing.

Platelets

The platelet count and the mean platelet volume (MPV) describe the cell fragments that start a clot.

Three calculated ratios

From the white cell and platelet counts, Clare calculates the neutrophil-to-lymphocyte ratio (NLR), the platelet-to-lymphocyte ratio (PLR) and the systemic immune-inflammation index (SII). Each sums up the balance between cell types as a broad inflammatory signal.

Who usually asks for it

• Doctors order it as part of a routine check-up, or to look into symptoms that could point to anaemia, an infection or a blood condition.
• It is used to follow conditions and treatments that change blood counts, such as infections, anaemia, immune conditions, blood cancers and some medicines.
• In the UAE, a CBC is part of the premarital screening offered through MOHAP health centres, alongside tests for inherited blood conditions such as beta thalassaemia, haemoglobin variants and sickle cell disease.

Preparing for the test

A CBC needs no fasting by itself. Clare's panel also includes fasting glucose and fasting insulin, which are measured on a fasting sample, so follow the fasting instructions for the panel as a whole. Dehydration concentrates the blood and can push red cell results up, so arrive normally hydrated unless you are told otherwise. Hard exercise and acute stress can double the white count within hours, so a CBC meant as a baseline is most useful on an ordinary day when you are well. Tell the person taking the sample about recent illness, pregnancy and any medicines, especially steroids.

How the results are read together

A CBC is read as patterns, not as single numbers. These are the shapes a doctor usually looks for, and the step that usually follows. None of them is a diagnosis on its own.

• Low hemoglobin with small red cells (low MCV). The two most common causes are iron deficiency and thalassaemia trait. Ferritin is usually the next test. A red cell count in the high to normal range alongside small cells leans towards thalassaemia trait, which is confirmed with a haemoglobin test for variants.
• Low hemoglobin with large red cells (high MCV). Common causes include low vitamin B12 or folate, alcohol and some medicines; an underactive thyroid and liver disease are among the others. Vitamin B12 is usually checked, along with a blood film and a reticulocyte count.
• Low hemoglobin with normal-sized cells. This shape can follow long-running inflammation or kidney problems, and the history usually points the way.
• High white count driven by neutrophils. Often a response to infection, injury, hard exercise, emotional stress, smoking or steroid medicines. CRP helps tell an active response from a passing one.
• Low neutrophils with everything else in range. Often this is benign neutropenia, a naturally low count that carries no added risk of infection and is common among Emiratis (see below).
• Several lines out together. When red cells, white cells and platelets move at the same time, or immature cells appear, a doctor will usually repeat the count, look at a blood film under the microscope, and refer on to a haematologist if the picture does not settle.

Immature granulocytes, PLR and SII

Immature granulocytes are usually a very small share of the white cells. A study of more than 2,400 outpatient samples suggested upper limits of about 0.9% of white cells, or 0.07 × 10⁹/L (70 cells per microlitre), for anyone over 10 years old. Above that age, the most common reasons for a raised value were pregnancy, medicines such as steroids and chemotherapy, severe infection, and blood disorders.

PLR and SII have no agreed reference ranges, and most cut-offs in the research were set in people who were already unwell. In the Rotterdam Study of 8,711 Dutch adults aged 45 and over, the average PLR was 120, with 95% of people between 61 and 239, and the average SII was 459, with 95% between 189 and 1,168. Both ran higher in women and rose with age. These figures are a benchmark, not a pass mark.

Ranges, and the sample itself

Every CBC result is read against the reporting lab's own range, which depends on the analyser and method, the person's age and sex, pregnancy, and the altitude they live at. The range printed on your report is the one to read against.

The sample matters too. In a study of blood held at 33 °C, hematocrit, MCV, MCHC, the platelet count and MPV drifted beyond acceptable limits within 4 hours, while hemoglobin, the red cell count and the white cell count held for at least 24 hours. The authors called for shorter time limits wherever high temperatures are common, a point that applies wherever samples travel in hot weather.

The UAE picture

Two sets of UAE data give the blood count extra weight here. Inherited red cell conditions are common: of 6,420 UAE nationals screened before marriage by the Dubai Health Authority between 2007 and 2010, 8.5% were suspected carriers of a haemoglobin condition, including 4.56% with beta thalassaemia trait and 2.9% with sickle cell trait. That screening was based on the CBC together with a haemoglobin test (HPLC), and small red cells with a normal or high red cell count are the pattern that leads to the second test.

White cells differ too. In a study of 1,032 healthy Emirati adults at premarital screening in Al Ain, 10.7% had a neutrophil count below 1.5 × 10⁹/L with no added risk of infection. That matters when a low white count is read against ranges built in other populations.

Price in the UAE

When we read public prices on 11 October 2026, a CBC cost from 35 to 149 at 7 UAE providers. VAT is rarely stated, some are "from" or package prices, and home collection can add a fee, in one case 100 when the test was booked on its own.

Related tests

A CBC is usually read with Ferritin, Serum Iron and TIBC when red cells are small, with Vitamin B12 and Folate when they are large, and with the CRP test when the white cells suggest inflammation. Comprehensive blood test in Dubai: what to expect covers how to prepare for a full panel and why hydration matters for the red cell results.

Why the numbers mean more over time

A single result can sit just outside a range in a healthy person: the WHO's hemoglobin cut-offs, for example, are set at a level that 1 in 20 healthy people fall below. What tells you more is direction. A hemoglobin that drifts down across several results, or a white count that stays out of range on repeat tests taken when you are well, says more than one value a little outside the line. A CBC is commonly repeated at routine check-ups, and a change that holds is worth a conversation with a doctor, with your results in front of you.

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