White blood Cell (leukocyte) count WBC
by: Joe Hing kwok Chu
Adult Reference Range
4.5~11.0 X 103/無
(SI units: 4.5~11 X109/L
Pediatric Reference Range
New born: 900 ~ 30,000/無
2 weeks old: 500 ~ 20,000/無
1 year old: 6000 ~ 18,000/無
4 years old: 5500 ~ 17,000/無
10 years old: 4500 ~ 13,5000/無
percentage of each type of white blood cell in a sample.
To get the actual
number of each type of white blood cell in the sample, multiply the percentage
of the different white cells by the total count of white blood cells.
Pediatric Reference Range
Newborns: same as adult .
4 weeks: Neutrophils drop to 40%;
Lymphocytes rise to
10 months -20 years: a gradual return to adult ratio.
of the Test
1. Diagnosing diseases
2. Evaluating the stages of a particular disease as in monitoring
the the patient's progress and the effects of chemotherapy.
Drugs that decrease the eosinophil count:
Drugs that decrease the
Drugs that increase the
neutrophils count: epinephrine,
Time of the blood
sample drawn: low in the morning and high in the afternoon.
White blood cell that increases in response to parasitic infections
and allergic reactions.
Blood test that determines the percentage of each type of white blood
cell in a person's blood.
Eosinophil: White blood cell that increases in
response to parasitic infections and allergic reactions.
A white count increased to over 10,000/L.
A white count decreased to less than 4,000/L.
Lymphocyte: White blood
cell that fights viral and some bacterial infections by direct attack or
the production of antibodies.
Monocyte: It removes debris
and microorganisms by
- An increased
number of monocytes in the blood (monocytosis) occurs during a variety of
conditions including severe infections, chronic infections, auto-immune
disorders, blood disorders, and cancers. A low number of monocytes in the
blood (monocytopenia) can occur in response to the releasing of toxins into
the blood by certain types of bacteria, receiving chemotherapy or corticosteroids.
White blood cell that increases in response to bacterial infection. It removes
and kills bacteria through phagocytosis. A low number of neutrophil
increases the risk of infection.
Segmented neutrophils (polymorphonuclear
leukocytes, or segs) are the mature phagocytes that migrate through tissues
to destroy microbes and respond to inflammatory stimuli.
Phagocytosis: A process by which a white blood
cell envelopes and digests debris and microorganisms to remove them from
SARS and White Cell Count Study
Back to Complete Blood Cell Count
How white cell cannabalize virus infected cells.
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