CBC blood test
Complete blood count; Anemia - CBC
A complete blood count (CBC) test measures the following:
- The number of white blood cells (WBC count)
- The number of red blood cells (RBC count)
- The number of platelets
- The total amount of hemoglobin in the blood
- The fraction of the blood composed of red blood cells (hematocrit)
The CBC test also provides information about the following measurements:
- Mean red blood cell volume (MCV)
- Mean hemoglobin amount per red blood cell (MCH)
- The mean amount of hemoglobin relative to the size of the cell (hemoglobin concentration) per red blood cell (MCHC)
The complete blood count (CBC) is test, used to diagnose and monitor numerous diseases. It can reflect problems with fluid volume (such as dehydration) or loss of blood. It can show abnormalities in the production, life span, and destruction of blood cells. It can reflect acute or chronic infection, allergies, and problems with clotting. The CBC test identifies and counts the 7 types of cells found in the blood, red blood cell, neutrophil, eosinophil, basophil, lymphocyte, monocyte, and platelet.
Sickle cell anemia is an inherited blood disease in which the red blood cells produce abnormal pigment (hemoglobin). The abnormal hemoglobin causes deformity of the red blood cells into crescent or sickle-shapes, as seen in this photomicrograph.
This picture shows large, dense, oversized, red blood cells (RBCs) that are seen in megaloblastic anemia. Megaloblastic anemia can occur when there is a deficiency of vitamin B-12.
This photomicrograph shows one of the abnormal shapes that red blood cells (RBCs) may assume, a tear-drop shape. Normally, RBCs are round.
This photomicrograph shows normal red blood cells (RBCs) as seen in the microscope after staining.
Elliptocytosis is a hereditary disorder of the red blood cells (RBCs). In this condition, the RBCs assume an elliptical shape, rather than the typical round shape.
Spherocytosis is a hereditary disorder of the red blood cells (RBCs), which may be associated with a mild anemia. Typically, the affected RBCs are small, spherically shaped, and lack the light centers seen in normal, round RBCs.
Sickle cell anemia is an inherited disorder in which abnormal hemoglobin (the red pigment inside red blood cells) is produced. The abnormal hemoglobin causes red blood cells to assume a sickle shape, like the ones seen in this photomicrograph.
Basophils are a specific type of white blood cell. These cells are readily stained with basic dyes (this is where the name comes from). Note the dark grains inside the cellular fluid (cytoplasm) of this basophil. Basophils make up only a small portion of the number of white blood cells but are important parts of the body's immune response. They release histamine and other chemicals that act on the blood vessels when the immune response is triggered.
Malarial parasites are visible within the red blood cells. They are stained a dark bluish color.
Malaria is a disease caused by parasites. This picture shows dark orange-stained malaria parasites inside red blood cells (a) and outside the cells (b). Note the large cells that look like targets; it is unknown how these target cells are related to this disease.
These crescent or sickle-shaped red blood cells (RBCs) are present with Sickle cell anemia, and stand out clearly against the normal round RBCs. These abnormally shaped cells may become entangled and block blood flow in the small blood vessels (capillaries).
This photomicrograph of red blood cells (RBCs) shows both sickle-shaped and Pappenheimer bodies.
These abnormal red blood cells (RBCs) resemble targets. These cells are seen in association with some forms of anemia, and following the removal of the spleen (splenectomy).
Blood transports oxygen and nutrients to body tissues and returns waste and carbon dioxide. Blood distributes nearly everything that is carried from one area in the body to another place within the body. For example, blood transports hormones from endocrine organs to their target organs and tissues. Blood helps maintain body temperature and normal pH levels in body tissues. The protective functions of blood include clot formation and the prevention of infection.
How the Test is Performed
A blood sample is needed.
How to Prepare for the Test
There is no special preparation needed.
How the Test will Feel
When the needle is inserted to draw blood, you may feel moderate pain. Some people feel only a prick or stinging. Afterward there may be some throbbing or slight bruising. This soon goes away.
Why the Test is Performed
A CBC is a commonly performed lab test. It can be used to detect or monitor many different health conditions. Your health care provider may order this test:
- If you are having symptoms, such as fatigue, weight loss, fever or other signs of an infection, weakness, bruising, bleeding, or any signs of cancer
- When you are receiving treatments (medicines or radiation) that may change your blood count results
- To monitor a long-term (chronic) health problem that may change your blood count results, such as chronic kidney disease
Normal Results
Blood counts may vary with altitude. In general, normal results are:
RBC count:
- Male: 4.7 to 6.1 million cells/mcL
- Female: 4.2 to 5.4 million cells/mcL
WBC count:
- 4,500 to 10,000 cells/mcL
Hematocrit:
- Male: 40.7% to 50.3%
- Female: 36.1% to 44.3%
Hemoglobin:
- Male: 13.8 to 17.2 gm/dL
- Female: 12.1 to 15.1 gm/dL
Red blood cell indices:
- MCV: 80 to 95 femtoliter
- MCH: 27 to 31 pg/cell
- MCHC: 32 to 36 gm/dL
Platelet count:
- 150,000 to 450,000/dL
The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples. Talk to your doctor about the meaning of your specific test results.
What Abnormal Results Mean
High RBC, hemoglobin, or hematocrit may be due to:
- A lack of enough water and fluids, such as from severe diarrhea, excessive sweating, or water pills used to treat high blood pressure
- Kidney disease with high erythropoietin production
- Low oxygen level in the blood for a long time, most often due to heart or lung disease, chronic carbon monoxide exposure, or living at a high altitude
- Polycythemia vera
- Smoking
- Use of testosterone
Low RBC, hemoglobin, or hematocrit is a sign of anemia, which can result from:
- Blood loss (either sudden, or from problems such as heavy menstrual periods over a long time)
- Bone marrow failure (for example, from radiation, infection, or tumor)
- Breakdown of red blood cells (hemolysis)
- Cancer and cancer treatment
- Certain long-term (chronic) medical conditions, such as chronic kidney disease, ulcerative colitis, or rheumatoid arthritis
- Iron deficiency
- Leukemia
- Long-term infections such as hepatitis
- Poor diet and nutrition, causing too little iron, folate, vitamin B12, or vitamin B6
- Multiple myeloma
A lower than normal white blood cell count is called leukopenia. A decreased WBC count may be due to:
- Alcohol abuse and liver damage
- Autoimmune diseases (such as systemic lupus erythematosus)
- Bone marrow failure (for example, due to infection, tumor, radiation, or fibrosis)
- Chemotherapy medicines used to treat cancer
- Disease of the liver or spleen
- Enlarged spleen
- Infections caused by viruses, such as mono or AIDS
- Medicines
A high WBC count is called leukocytosis. It can result from:
- Certain medicines, such as corticosteroids
- Infections
- Diseases such as lupus, rheumatoid arthritis, or allergy
- Leukemia
- Severe emotional or physical stress
- Tissue damage (such as from burns or a heart attack)
A high platelet count may be due to:
- Bleeding
- Diseases such as cancer or blood disease
- Iron deficiency
- Problems with the bone marrow
A low platelet count may be due to:
- Disorders where platelets are destroyed
- Pregnancy
- Enlarged spleen
- Bone marrow failure (for example, due to infection, tumor, radiation, or fibrosis)
- Chemotherapy medicines used to treat cancer
Risks
There is very little risk involved with having your blood taken. Veins and arteries vary in size from one person to another, and from one side of the body to the other. Taking blood from some people may be more difficult than from others.
Other risks associated with having blood drawn are slight, but may include:
- Excessive bleeding
- Fainting or feeling lightheaded
- Hematoma (blood accumulating under the skin)
- Infection (a slight risk any time the skin is broken)
Considerations
RBCs transport hemoglobin which, in turn, carries oxygen. The amount of oxygen received by body tissues depends on the amount and function of RBCs and hemoglobin.
WBCs are mediators of inflammation and the
- Neutrophils (polymorphonuclear leukocytes)
- Band cells (slightly immature neutrophils)
- T-type lymphocytes (T cells)
- B-type lymphocytes (B cells)
- Monocytes
Eosinophils - Basophils
References
Lin JC, Benz Jr. EJ. Approach to anemia in the adult and child. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 35.
Means RT. Approach to the anemias. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 149.
Vajpayee N, Graham SS, Bem S. Basic examination of blood and bone marrow. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 24th ed. Philadelphia, PA: Elsevier; 2022:chap 31.
Version Info
Last reviewed on: 10/16/2022
Reviewed by: Mark Levin, MD, Hematologist and Oncologist, Monsey, NY. Review provided by VeriMed Healthcare Network. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
