Blood Testing - Cbc

Dr Ira Shah
Consultant Pediatrician, B.J.Wadia Hospital for Children, Mumbai, India
First Created: 02/07/2001  Last Updated: 08/01/2015

Patient Education

Routine blood test is also called as the complete blood count or CBC.

It is one of the most common tests performed.

What does CBC measure?

CBC usually is a measure of different kinds of cells present in the blood.

The cells normally present in the blood are:
Red blood cells (RBC): These cells contain hemoglobin and are responsible for carrying oxygen throughout the body. A decrease in RBC may cause fatigue and breathlessness.

White blood cells (WBC): These cells are the guardians of the body and fight against infection. Any abnormality in the level of WBC may be an indication of infection.

Platelets: These are blood cells that are responsible for clotting of the blood when we get hurt. A decrease in the platelet count may cause excessive bleeding and any abnormal increase in the platelet count may be responsible for sludging of the blood and slowing of circulation in particular organs of the body. Platelet counts may also increase in conditions like juvenile rheumatoid arthritis and other autoimmune disorders.

How is CBC measured?

Blood is collected either by a finger prick or a small sample of blood is collected from an accessible vein usually in the arm with a needle and a syringe. The part of the body from which blood is to be collected is cleaned with a sprit swab and then pricked with a needle. The collected blood sample is mixed with a chemical to prevent it from clotting and analyzed either under a microscope or under a computerized analyzer. The number of WBC, RBC, and platelets is determined and the results are usually ready in a few hours.

Blood Collection

For infants, the blood for analysis should be collected prior to feed, as milky & turbid serum interferes with certain testing. Serum should be stored or preserved by separating it after the blood clots and is kept in a sterile tube, bottle, which should be kept in the deep freeze until delivered to the lab. Blood for CBC and sugar examination to be delivered to the lab immediately after collection. Fasting samples in children is usually not required unless specially asked for (fasting blood sugar, triglycerides, etc).

Blood Testing - CBC Blood Testing - CBC 2015-08-01
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