Beckman Coulter COULTER LH 750 System, Справочник

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4-16
SPECIFICATIONS/CHARACTERISTICS
BAR CODES AND THE LH 700 Series
4.5 BAR CODES AND THE LH 700 Series
The LH 700 Series supports the use of up to 16-character bar-code labels and a wide variety of
bar-code symbologies. When choosing a symbology to use in your laboratory, it is important
to understand the different bar codes available. Some bar codes are more stable, and therefore
less prone to misreads than others.
The following information is intended as a guide to help you in your selection process.
Checksum Algorithm
Beckman Coulter strongly recommends the use of bar-code checksums to provide automatic
checks for read accuracy.
Bar-Code Symbologies Supported by the LH 700 Series
Interleaved 2-of-5
Interleaved 2-of-5 is a high density, continuous numeric symbology. It is self-checking. Every
character in the symbology encodes two digits, one in the bars and one in the spaces.
This symbology is susceptible to an incorrect read due to a partial scan (a scanning path that
does not include both leading and trailing quiet zones). The most common incorrect read is a
shorter, but valid decoding of the information. The presence of a checksum does not
eliminate this risk. It is recommended that any Interleaved 2-of-5 label contain Bearer Bars.
Alternatively, this label should be used with a fixed length only, with the scanning devices set
to recognize labels of a specific length (for example 12 digits).
Code 39 (Also called 3-of-9 Code)
Code 39 was the first alphanumeric symbology developed. It is a self-checking, discrete and
variable length symbology. The Health Industry Bar Code Council (HIBCC) has adopted the
use of a check character for health care applications. This is encouraged, particularly where
print quality is less than optimum.
IMPORTANT
1. DO NOT use the follo
win
g characters # @ [ \ ] ` { | } ~ in Specimen or Patient identifiers. There
is a potential for Specimen or Patient misidentification to occur. The system will substitute or omit these
characters when the system is configured in a language other than English or Chinese.
2. Risk of misidentification. Use of poor quality, dirty, improperly placed or damaged bar-code labels could
keep the instrument from reading the bar-code labels. Ensure the bar-code labels are undamaged. Ensure
the bar-code labels conform to the specifications provided in Chapter 4 of the Reference manual.
3. DO NOT use leading or trailing spaces in the ID.
IMPORTANT Use of bar codes is an extremely accurate and effective method of positive patient
identification. Certain features, such as checksum digits, maximize accuracy in reading Codabar, Code 39
and Interleaved 2-of-5 labels. Use checksums to provide protection against occasional misread errors
caused by problems such as damaged or misapplied labels. If you must use bar codes without checksums,
Beckman Coulter recommends that you verify each bar-code reading to assure correct patient identification.