Conseils d’achat Chemistry Analyzer, Manual

  1. When selecting a manual clinical chemistry analyzer, facilities should look into its test-menu options, the overall physical conditions in which it will be used, such as quality and availability of water supplies, electrical supplies, and space allocation.
  2. Bigger facilities can use clinical chemistry analyzer units that offer a broad range of tests as backup systems; physician offices or outpatient clinics can use such units as the primary instrument.
  3. These are some of the factors which determine the manual clinical chemistry analyzer's price: test-menu options, degree of operator input, price of reagents, disposables, and other supplies needed to operate the cholesterol analyzer.
  4. Users need to decide whether the clinical chemistry analyzer can perform the needed test mix prior to purchasing any analytic system.
  5. The clinical chemistry analyzers with the widest testing capabilities are those that use spectrophotometer. Filter photometers can only perform tests that are measurable at wavelengths for which the instrument has filters.
  6. When selecting a manual clinical chemistry analyzer, facilities should look into the following considerations:
  • A qualified user should be able to operate the cholesterol screening device with minimal error with the help of proper labeling, and instructions and a display that is easy to read and interpret.
  • A clearly written and comprehensive operator's manual should accompany the clinical chemistry analyzer, describing test methodology, all operating controls functions, error messages, diagnostics, and troubleshooting instructions for minor problems.
  • Manual clinical chemistry analyzer operating instructions should also identify all consumables and frequently replaced parts, and the manual should also provide guidance on the routine use of control material to ensure proper system operation.
  • Preventive maintenance should be minimal and easy to perform, and the clinical chemistry analyzer should be easy to clean, disassemble, and reassemble.
  •  The cholesterol screening device user should never be exposed to any biohazards by the unit or any of its accessories.
  1. These are some of the features to be considered by facilities buying an clinical chemistry analyzer:
  • The concentration range over which a manual clinical chemistry analyzer can measure a particular analyte. This value should be checked carefully, because the actual range may vary significantly from that stated by the manufacturer.
  • The ability to determine the true or actual value of an analyte and standards or controls used to verify this is typically instrument-specific and is supplied by the cholesterol screening device’s manufacturer.
  • The linearity of a cholesterol analyzer determines how accurately the unit can measure analyte concentration over a certain concentration range as determined by a given control or standard.
  • Clinical chemistry analyzers with large linear ranges can analyze samples with a wide range of analyte concentrations without diluting or manipulating them in any way; this feature provides faster turnaround of results and may save operator time if dilutions must be manually performed.
  • A high degree of precision (which is a measure of how closely a test result can be reproduced) not only provides a more sensitive determination of changes in the patient's condition, but also may reduce the need for duplicate testing to verify the accuracy of initial test results.
  • Cholesterol screening devices that give readings with a high degree of precision for extended periods of use have very stable calibration curves.
  • These units may be less costly to operate than manual clinical chemistry analyzers with more labile curves, because they do not require recalibration as often. Therefore, the unit uses fewer calibration standards and runs fewer patient analytical tests.
  • A clinical chemistry analyzer with low specificity for a particular analyte cannot discriminate between it and similar, but different substances and may include them all in the analyte measurement.
  • Clinical chemistry analyzers that measure a substance nonspecifically may provide results that can potentially lead to a false diagnosis and require testing verification on other instruments, increasing the cost of testing.
  • Medical Centers should consider whether the manual clinical chemistry analyzer can accept future hardware upgrades and can interface with medical center computer systems.  The cost of upgrading the software annually should be included in an estimate of recurring expenses.
  1. Long-term storage of results for physician review or for entry into a data management system requires a large memory.
  2. Medical centers can simplify record keeping and quality control using built-in data management systems that store and print quality control or patient test values or transfer it to a computer. However, these are not essential features but they facilitate data organization for inspections by various agencies.
  3. For medical facilities, the storage of the date, time, and patient/operator identification is essential.
  4. Tests in the waived tests category involve very little or no training or experience to perform. These do not require elaborate quality control, and therefore are less likely to produce inaccurate results.
  5. Most clinical laboratory tests, including automated urine, blood, and chemistry analyses, belong to the moderate complexity category. Tests and analyses in this group need a limited amount of sample and reagent preparation, as well as limited operator intervention during the analytical process.
  6. The highly complex category includes procedures that require a high degree of operator preparation, extensive education and training, calibration, intervention, and analysis, such as clinical cytogenetic and histopathology applications.
  7. Facilities should be aware of the fact that purchasing or upgrading a device can change the complexity category of the procedures.
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