Figure 5-5 Random Error from Bubbles, Foam or Precipitates Absorbance Time Panel A Panel B Read Window Absorbance Time Read Window Expected absorbance increases are smooth, regular curves (Panel A). The presence of bubbles, foam or particle in the photometric window will cause sporadic high or low values (Panel B).
Learning Guide: Sources of Error 59 Review Questions • Section 5 1. Which of the following is an example of a preanalytical error? (circle the correct response): A Test method incorrectly calibrated B Collection of blood in wrong kind of tube C Presence of interfering substance in specimen D Delay in sending the report to the provider 2. Which type of analytical error can be prevented by a good quality control program? 3. Which type of analytical error is recognized by an HIL index? 4. What option(s) might be employed if a test result is above the upper limit of the test measurement range? (circle all of the possible answers): A Manual dilution followed by reanalysis of the diluted sample B Automatic dilution and reanalysis of the sample C Use of a reaction rate algorithm using two read windows for an enzyme assay D Reporting the result as higher than the upper limit of the test method
Learning Guide : Common Clinical Chemistry Tests 60 Section 6 Common Clinical Chemistry Tests Overview This section identifies analytes that most commonly comprise clinical chemistry test menus, describes their metabolic function and some pathological conditions for which the analyte might be measured. Learning Objectives After completing this section you should be able to: 1. Identify what analyte is being measured in common chemistry tests 2. Explain when certain tests might be ordered 3. Identify medical conditions that might lead to a high or low test resultKey Concepts 1. Clinical chemistry tests measure a wide variety of analytes that reflect many different organ systems and diseases. 2. Some test results are specific indicators for a single organ system or disease; others are general indicators of a disease or disorder, but do not pinpoint the specific organ or disease process. 3. Tests are performed for different reasons. Some tests help diagnose a disease, others monitor the course of the disease progression or effectiveness of therapy, and still others are used to screen for risk of developing a disease.
- Summer '19
- The American, blood plasma, Clinical Chemistry