Variations in the structure and function of blood cells may not only cause
disease, but may also occur as a result of a disease process . In health, mature,
functioning blood cells enter the bloodstream and are able to carry out
the work of the blood. In disease, immature, poorly formed cells may be
found in the blood and are often unable to carry out the work of the blood.
Blood Cell Tests
The blood cell tests presented in this chapter focus on cell number, size, or
structure . Tests are presented by individual cell type and include diagnoses
related to variations from normal.
Normal ranges of blood cell tests depend on a variety of factors including
the age of the individual being tested and the individual laboratory standards
where the tests are run. There are a variety of factors that may cause an
abnormal test result. These factors are listed with the description of each test.
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