title: A practical evaluation of accuracy with the standard deviation index (SDI) chart method. Second report. Report covering the period from April 1980 to March 1983.
abstract: To evaluate the accuracy of laboratory data for 18 items determined with an Technicon SMAC (Sequential Multiple Analyzer Computer), the SDI chart method was used in investigating the data according to five kinds of control survey programs from April 1980 to March 1983. The results can be summarized as follows: Inorganic phosphorus showed a gradual downward shift, arriving at the minus side of SDI in all control surveys. Potassium showed a particularly large fluctuation as was the case in the previous evaluation. The other items were relatively stable (i.e., showed less fluctuation), although many of them showed an upward shift. Some of the control survey programs yielded biased evaluation results. Thus, the SDI chart method proved to allow, as one of the external quality control techniques, observation of long-term, slight changes without necessitating any complicated calculation. Furthermore, it was confirmed that this is a practically useful method of accuracy evaluation because it allows overall evaluation of the data from various control survey programs on the same graph.
mesh_terms: D000469:Alkaline Phosphatase / Q000097:blood; D001663:Bilirubin / Q000097:blood; D001774:Blood Chemical Analysis / Q000379:methods*; D001786:Blood Glucose / Q000032:analysis; D001798:Blood Proteins / Q000032:analysis; D003404:Creatinine / Q000097:blood; D005069:Evaluation Studies as Topic; D006801:Humans; D010758:Phosphorus / Q000097:blood; D011188:Potassium / Q000097:blood; D013223:Statistics as Topic
chemical_list: D001786:Blood Glucose; D001798:Blood Proteins; D010758:Phosphorus; D003404:Creatinine; D000469:Alkaline Phosphatase; D001663:Bilirubin; D011188:Potassium