Beckman Coulter COULTER LH 750 System, Справочник

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PN 4277248DD
4-14
SPECIFICATIONS/CHARACTERISTICS
BAR-CODE SYMBOLOGY OVERVIEW
*National Committee for Clinical Laboratory Standards is now the Clinical and Laboratory
Standards Institute (CLSI).
4.4 BAR-CODE SYMBOLOGY OVERVIEW
A bar-code symbol is a series of adjacent bars and spaces. The widths of the bars and spaces
represent the actual data encoded within the symbol. A device, usually called a scanner, or
reader is used to decode this data into human readable information. A bar-code symbology,
such as Interleaved 2-of-5, describes the unambiguous conventions or rules used for the way
in which data is encoded into the arrangement of the adjacent bars and spaces.
RBC Very high WBC count, high concentration of very large platelets,
auto-agglutination.
If hemolysis is occurring in vivo, the instrument RBC may be flagged as low,
reflecting the true circulating cells. If, however, the hemolysis is in vitro, the
specimen may give falsely low RBC results. Cell counts due to in vitro hemolysis
do not represent the number of circulating red blood cells.
Hgb Very high WBC count, severe lipemia, heparin, certain unusual RBC
abnormalities that resist lysing.
MCV Very high WBC count, high concentration of very large platelets,
auto-agglutination.
RDW Very high WBC count, high concentration of very large platelets,
auto-agglutination.
Plt Giant platelets, platelet clumps, white cell fragments, electronic noise, very small
red cells, red cell fragments
Hct Known interferences related to RBC and MCV.
MCH Known interferences related to Hgb and RBC.
MCHC Known interferences related to Hgb, RBC and MCV.
NRBC Known interferences related to lyse resistant red cells, platelet clumps, giant
platelets, malarial parasites, very small or multi-population lymphocytes,
precipitated elevated proteins. Small NRBC that are below the lower counting
threshold will not be enumerated. Large NRBC >35 fL may be counted as WBC.
The presence of a majority or NRBC that are very small or very large may result
in a false negative condition. If an NRBC% is reported as zero and there are any
suspect messages or parameter codes, Beckman Coulter, Inc. recommends a
slide review per your laboratory protocol.
Cord blood is a recognized source of high numbers of NRBC. However, due to
the possible matrix effect of the sample constituents that may be introduced
during sample, cord blood is not recommended for NRBC studies.
Differential Hypogranular granulocytes, agranular granulocytes, lyse-resistant red cells, very
small or multi-population lymphocytes, elevated triglycerides, precipitated
elevated proteins.
Reticulocytes Erythrocyte inclusions stained by New Methylene Blue, if sufficiently numerous
within a sample, and some hemoglobinopathies (SS, SC) might affect the
accuracy of the reticulocyte enumeration.
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