White blood cell (WBC) count is a blood test that measures the number of white blood cells (WBCs) in a blood sample. Normal range of WBC count is 4000 – 11000 cells/ cu mm. The test is a part of the most routine complete blood count (CBC) test. A value above 11000 is termed as leukocytosis and a value less than 4000 is termed as leukopenia. A slightly elevated count can also be seen in pregnancy or in children below the age of 2 years. WBC counts are high during an infection. A very high count could indicate leukaemia. Low levels of WBCs are commonly seen in people on steroid or cancer medications. Low WBC levels could also indicate a malfunctioning of the bone marrow.

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