Complete Blood Count (CBC) – Its importance and Normal range

Complete Blood Count Test (CBC)

This Complete Blood Count test i.e. CBC blood test is done to objectify many diseases, whereas the lists contain many imperative values, characteristically is consisted the following:

  • White blood cell count (WBC or leukocyte count)
  • WBC differential count
  • Red blood cell count (RBC or erythrocyte count)
  • Hematocrit (Hct)
  • Hemoglobin (Hbg)
  • Mean corpuscular volume (MCV)
  • MCH – Mean corpuscular hemoglobin
  • MCHC – Mean corpuscular hemoglobin concentration
  • Red cell distribution width (RDW)
  • Platelet count
  • Mean Platelet Volume (MPV)

What Is A CBC?

The complete blood count (CBC) is one of the most frequently prearranged test. This test is done basically done to assess your in general health and perceive an ample range of disorders, including infection, anemia and leukemia and the ratio of red blood cell to the fluid section or plasma, in your blood. These calculations are commonly resolute by specific machinery that scrutinize the different mechanisms of blood in less than a minute.

The Three Basic Types Of Blood Cells

Quantifying certain changes in your blood cell levels will help your healthcare specialist to assess your overall physical condition and identify disorders. The test basically evaluates the three major types of blood cells.

Red blood cells

Type Red blood cell generally indicates the number of red blood cells present. Standard array varies somewhat between laboratories but is generally considered from 4.2 to 5.9 million cells/cmm. This can likewise be alluded to as the erythrocyte count and can be articulated universally in units as 4.2 to 5.9 x 1012 cells for each liter.

Red blood cells are mainly the most ordinary cell type in blood and found in millions in a human body, in their blood circulations. The size of each red blood cell is smaller than white blood cells, but in comparison, the WBC consist of larger platelets

Complete Blood Count Test

White blood cells

The white blood cells (WBC) differential alludes to the number of the distinctive kinds of white platelets found in the blood. The normal range of white blood cells is considered as 4,500 to 10,000 cells per microliter (cells/mcL). The distinctive kinds of WBCs that have particular capacities that are routinely announced in a total blood tally are neutrophils, lymphocytes, basophils, eosinophils, and monocytes. White blood cells generally help your body to fight against infections.


Platelets are a major component in your body, which helps in clotting and controls bleeding. Suppose meet with a cut in hand and it stops bleeding, this change happens because of platelets. Any sudden change in platelets level, can take you to higher risks of extreme bleeding and also can lead you to serious medical state. Normal range of Platelets is considered as 140,000 to 450,000 cells/mcL.

Few more important components:

  • Hemoglobin (Hbg)

measures the measure of the hemoglobin atom in a volume of blood and typically is 13.8 to 17.2 grams for every deciliter (g/dL) for men and 12.1 to 15.1 g/dL for ladies.

  • Hematocrit (Hct)

means the level of the entire blood involved by red platelets and as a rule, goes between 45%-52% for men and 37%-48% for ladies.

  • MCV i.e. Mean corpuscular volume

is the estimation of the normal size or volume of a commonplace red platelet in a blood test and as a rule runs between 80 to 100 femtoliters (a small amount of one-millionth of a liter).

  • MCH i.e. Mean corpuscular hemoglobin

measures the measure of hemoglobin in a normal red platelet and generally goes between 27 to 32 picograms (a little part of a gram).

  • Mean corpuscular hemoglobin fixation (MCHC) –

measures the normal hemoglobin focus in a volume of blood, and it for the most part runs between 32%-36%.

  • Red cell dissemination width (RDW)

measures the inconstancy in the red platelets’ size and shape and for the most part runs between 11 to 15.

  • Mean platelet volume (MPV)

measures the normal size of platelets in a volume of blood. The ordinary range is between 6 to 12 femtoliters (a little portion of a liter).

When is a CBC ordered?

Your healthcare specialist may call for a CBC as an element of routine health check-up or if you have baffling symptoms such as bruising or bleeding.

A CBC can aid your physician do the following:

  • Assess your overall health:

Many specialist call for CBC test to evaluate the baseline of your health. A CBC also helps your health care specialist to screen your health problems through it.

  • Detect a health issue

Doctors order for CBC if they sense any inexplicable symptoms like tiredness, weakness, redness, swelling, bleeding or bruising.

  • Examine a health hitch

Your doctor might order for CBS test to examine your health condition, you have been diagnosed with any disarray, which might effect your blood cell count.

  • Supervise your treatment —

Several time your medical treatment might effect your blood cell counts and call for regular CBS blood test, where your health care specialist will evaluate on the basis of CBC that how well your treatment is working.

Getting ready for a CBC

Though there is no hard and fast rule, you can normally eat and drink  before your CBC test. However, your doctor may ask you for a specific time fast before the test.

You can typically eat and drink normally before a CBC. However, your doctor may require that you fast for a specific amount of time before the test. That is normal if the blood test will be utilized for extra testing. Your specialist will give you particular directions.

What happens during a CBC?

Amid a CBC, a lab specialist will draw blood from a vein, ordinarily from within your elbow or from the back of your hand. The test will take just a couple of minutes.

The expert:

  1. Cleans your skin with a clean wipe
  2. Places a versatile band, or tourniquet, around your upper arm to enable the vein to swell with blood
  3. Inserts a needle in the your skin and gathers a blood test in at least one vials
  4. Removes the versatile band
  5. Covers the region with a gauze to stop any dying
  6. Label your example and send it to a lab for examination

A blood test can be somewhat awkward. At the point when the needle punctures your skin, you may feel a prick or squeezing sensation. A few people likewise feel black out or bleary eyed when they see blood. Subsequently, you may have minor wounding, however i,t will clear up inside a couple of days.

Most CBC test results are accessible within a couple of hours to multi day subsequent to testing.

What do the results mean?

Test results will vary based on your blood cell counts. Here are the normal results for adults, but different labs may deliver slight variations:

Test result may vary based on the level of your blood cell count.

Below are discussed normal results for adults but different laboratories may provide minor variation:

Red blood cell –               

In men: 4.32-5.72 million cells/mcL
In women: 3.90-5.03 million cells/mcL

Hemoglobin –

In men: 135-175 grams/L
In women: 120-155 grams/L

Hematocrit –

In men: 38.8-50.0 percent
In women: 34.9-44.5 percent

White blood cell count –

3,500 to 10,500 cells/mcL

Platelet count –

150,000 to 450,000/mcL


A CBC is definitely not a complete analytic test. Platelet checks that are too high or too low could flag a wide assortment of conditions. Particular tests are, expected to analyze a particular condition.

Conditions that could cause an unusual CBC and may require extra testing include:

  • Iron or other vitamin and mineral deficiency
  • Bleeding disarranges
  • Heart infection

Complete Blood Count

  • Autoimmune disarranges
  • Bone marrow issues
  • Cancer
  • Infection or aggravation
  • Reaction to drug

In the event that your CBC demonstrates anomalous levels, your specialist may arrange another blood test to affirm comes about. They may likewise arrange different tests to enable further to assess your condition and affirm a conclusion.

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