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Regulatory Information
9-45
WBC DIFF Method
Intended Use
The ADVIA 2120/2120i Hematology System White Blood Cell Differential
(
WBC DIFF
) methods, consisting of both the Peroxidase method and the
Basophil/Lobularity method, are intended to quantitatively measure the following
WBC hematological parameters:
Neutrophils:
percentage of WBC (%NEUT) and absolute count (#NEUT)
Lymphocytes:
percentage of WBC (%LYMPH) and absolute count (#LYMPH)
Monocytes:
percentage of WBC (%MONO) and absolute count (#MONO)
Eosinophils:
percentage of WBC (%EOS) and absolute count (#EOS)
Large Unstained Cells:
percentage of WBC (%LUC) and absolute count
(#LUC)
Basophils:
percentage of WBC (%BASO) and absolute count (#BASO)
Principles of the Procedure
Peroxidase Method
The peroxidase method was developed by Cremins, Kim, Malin, and Sclafani,
based on the principles of differential cellular staining outlined by Ansley and
Ornstein. According to these principles, leukocytes are classified by the
characteristic properties exhibited by cell-specific constituents when the cells are
treated with cytochemical stains. The enzyme peroxidase is present and active in
several leukocyte types. In the presence of hydrogen peroxide and an appropriate
electron acceptor chromogen, peroxidase develops a darkly colored material
which precipitates in the cells. Normal neutrophils and eosinophils possess
significant levels of peroxidase activity, with enzyme activity corresponding to
cell maturation.
The monocytes were demonstrated to contain lower amounts of peroxidase,
which made it possible to define them as a cell population with relatively large
light-scatter signals and absorption signals that extend from the unstained cells
up to, and partly overlapping, the most weakly-stained neutrophils.
The lymphocyte population analyzed with the Peroxidase Method contains both
lymphocytes and basophils. The basophil count (obtained from the
Basophil/Lobularity method) is subtracted from the lymphocyte population to
obtain the lymphocyte count.
The peroxidase cytochemical reaction consists of 2 steps. In the first step, EDTA
anticoagulated whole-blood sample is diluted with ADVIA 120 PEROX 1
reagent. Surfactants and thermal stress cause lysis of the red blood cells.
Formaldehyde in ADVIA 120 PEROX 1 reagent fixes the white blood cells.
Содержание ADVIA 2120
Страница 1: ...ADVIA 2120 2120i Hematology Systems Operator s Guide 067D0157 01 Rev 201 0 ...
Страница 30: ...1 26 Welcome to the ADVIA 2120 2120i Hematology System ...
Страница 46: ...3 12 Daily Routine ...
Страница 171: ...7 2 Status Line messages T 93 U 94 V 96 W 98 X 99 Y 99 Z 99 ...
Страница 269: ...7 100 Status Line messages ...
Страница 341: ...8 72 Methods ...
Страница 477: ...B 14 Warnings and Safety Information ...