Complete Blood Count

Definition of Complete Blood Count:

A set of measurements that are generally determined by specially designed machines that analyze the different components of blood in less than a minute.  The values generally included are:

  • White blood cell count (WBC).  The number of white blood cells in a volume of blood.  Normal range varies slightly between laboratories but is generally between 4,300 and 10,800 cells per cubic millimeter.  This can also be referred to as the leukocyte count and can be expressed in international units as 4.3 – 10.8 x 10^9 cells per liter.
  • Automated white cell differential.  A machine-generated percentage of the different types of white blood cells, usually split into granulocytes, lymphocytes, monocytes, eosinophils, and basophils.
  • Red cell count (RBC).  The number of red blood cells in a volume of blood.  Normal range varies slightly between laboratories but is generally between 4.2 – 5.9 million cells per cubic millimeter.  This can also be referred to as the erythrocyte count and can be expressed in international units as 4.2 – 5.9 x 10^12 cells per liter.
  • Hemoglobin (Hb).  The amount of hemoglobin in a volume of blood.  Normal range for hemoglobin is different between the sexes and is approximately 13 – 18 gm/dl for men and 12 – 16 for women (international units 8.1 – 11.2 millimoles/liter for men, 7.4 – 9.9 for women).
  • Hematocrit (Hct).  The ratio of the volume of red cells to the volume of whole blood.  Normal range for hematocrit is different between the sexes and is approximately 45 – 52% for men and 37 – 48% for women.
  • Mean cell volume (MCV).  The average volume of a red cell.  This is a calculated value derived from the hematocrit and red cell count.  Normal range is 86 – 98 femtoliters.
  • Mean cell hemoglobin (MCH).  The average amount of hemoglobin in the average red cell.  This is a calculated value derived from the measurement of hemoglobin and the red cell count.  Normal range is 27 – 32 picograms.
  • Mean cell hemoglobin concentration (MCHC).  The average concentration of hemoglobin in a given volume of red cells.  This is a calculated volume derived from the hemoglobin measurement and the hematocrit.  Normal range is 32 – 36%.
  • Red cell distribution width (RDW).  A measurement of the variability of red cell size.  Higher numbers indicate greater variation in size.  Normal range is 11 – 15.
  • Platelet count.  The number of platelets in a volume blood.  Platelets play a vital role in blood clotting.  Normal range varies slightly between laboratories but is in the range of 150,000 – 400,000 per cubic millimeter (150 – 400 x 10^9 per liter).
Also: CBC

Topics Related to Complete Blood Count

Aminoguanidine a treatment
“...Semi-monthly CBC and chemistry blood tests should be considered in order to protect against any unknown toxicities.”


...the condition
“...If anemia is suspected, a complete blood count is used to check the levels of red blood cells (hematocrit) and hemoglobin in the blood...”
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More topics Related to Complete Blood Count

CBC (Complete Blood Count) Test a treatment
“The Complete Blood Count (CBC) is a very common test that used to be ordered on every person during his or her yearly physical...”

Chediak-Higashi Syndrome

...the condition
“...If CHS is suspected, the following tests maybe used ... Complete blood count, including white blood cell count...”

Cirrhosis of the Liver

...the condition
“...Tests can reveal liver problems including ... Anemia (detected on a CBC)...”

Clostridium Difficile Infection

...the condition
“...Other testing includes a complete blood count (CBC) which may indicate an increase in the number of white cells in the blood, usually caused by an infection...”


...the condition
“...A complete blood count should be obtained to look for evidence of anemia or an abnormal white blood cell count...”


...the condition
“...A CBC shows decreased white blood cells (leukopenia), decreased platelets (thrombocytopenia); a granulocyte stain shows clumps of bacteria inside white blood cells; the platelet count shows decreased...”

Enlarged Spleen

...the condition
“...Blood tests such as a CBC; Ultrasound; Abdominal film or CT scan; Bone marrow biopsy; Other tests to check for underlying disorders...”

Female Hair Loss

...recommendation Test Iron Stores (Ferritin)
“...Laboratory evidence of such a deficiency may show up on a complete blood count, serum iron or serum ferritin.”

Heavy Metal Toxicity

...the condition
“...Arsenic Useful lab tests include Urinalysis (Oliguria, Hematuria, Hemoglobinuria); Complete Blood Count and Peripheral Smear (Macrocytic Anemia); Tissue Exam (reveals arsenic deposits – urine, nails, hair) and Serum Arsenic levels...”

High White Blood Cell Count

...the condition
“...The white blood cell count is routinely tested as part of a complete blood count and further studies are usually needed if abnormalities are discovered through this test...”

Hives (Urticaria)

...the condition
“...For chronic urticaria, lab work should include CBC, ESR, UA, histamine levels and dental/sinus examinations to rule out hidden pathology...”

Infectious Mononucleosis - Mono

...the condition
“...Other tests your doctor might order include a complete blood count (CBC) to see if your blood platelet count is lower than normal and if lymphocytes are abnormal, and a chemistry panel to see if liver enzymes are abnormal...”

Iron Deficiency Anemia

...the condition
“...Serum ferritin is a better measure of body iron stores than any value in the complete blood count, as it will begin dropping long before other signs appear in the blood...”

Liver Abscess

...the condition
“...breath, difficulty breathing, wheezing, or choking); Severe abdominal pain; Vomiting; A diagnostic workup generally includes several of the following: Abdominal ultrasound; Abdominal CT scan or MRI; Complete blood count; Liver abscess aspiration (verifies bacterial infection); Liver scan; Liver function tests; Blood test; Stool test; When detected in time, a liver abscess is usually treatable...”

Low White Blood Cell Count

...the condition
“...The white blood cell count is performed routinely as part of a complete blood count.  An unusually high white blood cell count can indicate an infection, hypersplenism, bone marrow depression (drugs, radiation or heavy metal poisoning) or primary bone marrow...”


...the condition
“...The systemic evaluation for melanoma metastases involves ... Complete Blood Count (CBC)...”

Menorrhagia (Heavy Periods)

...the condition
“...When it has been determined that the cause is not organic (a physical condition), laboratory testing (bleeding time, complete blood count, and thyroid function) should be done, and any abnormalities corrected.”
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More topics Related to Complete Blood Count

Morning Sickness

...the condition
“...Diagnostic tests that may be performed include blood tests (including CBC and blood chemistry) and urine analysis for ketones and to determine severity of dehydration...”

Multiple Myeloma

...the condition
“...A Complete Blood Count (CBC)...”


...the condition
“...A complete blood count, blood smear, bone marrow biopsy, and genetic testing are the methods generally used to confirm a diagnosis and rule out other causes of the symptoms...”

Myeloproliferative Neoplasm

...the condition
“...Useful laboratory tests include ... Complete blood count (CBC) and differential count with microscopic examination of the peripheral smear...”

Need For Routine Preventative Health Measures

...the condition
“...For those who already have unresolved health issues, further testing may be required, such as prostate-specific antigen, complete blood count, thyroid, colon cancer, or H. pylori...”


...the condition
“...marrow; Certain medications such as the phenothiazines drugs, which are used to treat psychosis, allergies, and vomiting; Antibiotics; Blood pressure drugs; Psychiatric drugs; Epilepsy drugs; In a complete blood count (CBC) report, neutrophils may be referred to as polymorphonuclear cells (polys) or neutrophils...”


...the condition
“...In a complete blood count (CBC) report, neutrophils may be referred to as polymorphonuclear cells (polys) or neutrophils...”

Orbital Cellulitis

...the condition
“...Tests commonly include: Complete blood count; Blood culture and sensitivity; Spinal tap in extremely sick children...”


...the condition
“...Diagnostic laboratory testing includes a complete blood count (CBC), the erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), and blood cultures...”


...the condition
“...Blood tests (CBC), urine analysis, stool samples and comprehensive metabolic panel can help monitor advanced chronic inflammation and the disease's progress...”


...the condition
“...Types of testing for sarcoidosis include: CBC; chem-7 or chem-20; ACE levels; chest X-ray; lymph node biopsy; skin lesion biopsy; bronchoscopy; open lung biopsy; gallium scan; nerve biopsy...”

Subphrenic Abscess

...the condition
“...Blood tests (including CBC with white blood cell differential, erythrocyte sedimentation rate) show a leukocytosis and the patient may be anemic...”


...the condition
“...Common tests ... CBC (increased eosinophils)...”

Urinary Retention

...the condition
“...Tests that are commonly performed are: Midstream Specimen of Urine (MSU) test; Blood tests, including: Complete Blood Count (CBC), Urea and Electrolytes (U+E), Creatinine, Estimated Glomerular Filtration Rate (eGFR), Blood Glucose; Imaging studies, including: Ultrasound, CT Scan, MRI/CT brain scan...”

Valley Fever (Coccidioidomycosis)

...the condition
“...Skin tests, blood tests, and sputum cultures can be used for the diagnosis ... CBC with differential shows elevated eosinophils...”

West Nile Virus

...the condition
“...Diagnostic tests that may be used if West Nile virus is suspected include the following ... CBC – may show a normal or elevated white blood cell (WBC) count...”

Whooping Cough (Pertussis)

...our question about Your lymphocyte count
“A complete blood count may show large numbers of lymphocytes in a pertussis patient.”
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